In order to solve the following system of equations by subtraction, which of the following could you do before subtracting the equations so that one variable will be eliminated when you subtract them?
4x-2y=7
3x-3y=15
A. Multiply the top equation by-3 and the bottom equation by 2
B. Multiply the top equation by 1/3
C. Multiply the top equation by 15 and the bottom equation by 7
D. Multiply the top equation by 3 and the bottom equation by 4.
Answers
9514 1404 393
Answer:
D. Multiply the top equation by 3 and the bottom equation by 4.
Step-by-step explanation:
If you're using subtraction, you want the coefficients of one of the variables to be the same in both equations. If the variable you choose is x, then you need to multiply the top equation by the coefficient of x in the bottom equation (3), and the bottom equation by the coefficient of x in the to equation (4). Doing this will make both x-coefficients equal to 3×4 = 12. In short, ...
Multiply the top equation by 3 and the bottom equation by 4.
Related Questions
A box of pancake mix states that 1 1/2 cups of pancake mix and 1 cup of water are needed to make 8 pancakes. How many cups of pancake mix and water are needed to make 12 pancakes?
A. 2 cups of pancake mix and 1 1/2 cups of water
B. 2 1/2 cups of pancake mix and 1 3/4 cups of water
C. 2 1/4 cups of pancake mix and 1 1/2 cups of water
D. 2 3/4 cups of pancake mix and 1 1/4 cups of water
Answers
Answer:
I think your answer is B
Step-by-step explanation:
Answer:
boot
Step-by-step explanation:
I'll mark you brainliest if you give me the correct answer?
Answers
Answer and Step-by-step explanation:
We are asked to turn this fraction ([tex]\frac{9}{10}[/tex]) into an equivalent fraction, but with a denominator of 100.
[tex]\frac{9 <- Numerator}{10<-Denominator}[/tex]
All we have to do is multiply the numerator and denominator by 10, since 10 times 10 equals 100.
[tex]\frac{9}{10} * \frac{10}{10} = \frac{90}{100}[/tex]
The answer is:
[tex]\frac{90}{100}[/tex]
#teamtrees #WAP (Water And Plant)
Answer:
90/100
Step-by-step explanation:
9/10, when multiplied by 10/10, is 90/100.
Hope this helps!
xoxo,
cafeology
Which two fractions are equal to 2?
Answers
yea 2/1 and 4/2..........
You will get brainliest and 5 stars.
Greg went to see a play at a theater downtown. The play started at 7:20 P.M. The first act was 1 hour and 20 minutes long. Intermission lasted for 55 minutes, and the second act was 55 minutes long. What time was it when the play finished?
Answers
please help i don’t understand
Answers
Answer:
well i dont either
Step-by-step explanation: i'm
weird
Carlos is picking 6/384 apples. Mateo is picking oranges of 10. How much did Mateo pick?
Answers
Question might be incomplete or incorrect so we'd have to assume Mateo took apples
Answer:
5/189 apples
Step-by-step explanation:
If Carlos picks 6/384 apples then there must be 384 apples available to pick from. Amount of apples left after Carlos picks =384-6=378 apples
If Mateo picks 10 apples after Carlos then how much apples Mateo has taken would depend on the number of apples available, hence the fraction of apples Mateo has taken = 10/378
Reduce to lowest terms to get 5/189 apples
evaluate n²+5 when n=3
Answers
Answer:
14
Step-by-step explanation:
When you sqaure a number you multiply it by itself once so it would be (3x3) + 5. Rmemeber PEMDAS, so you multiply 3x3 first to get 9 and then you add 5 to get 14.
When 11 is subtracted from twice a number, the square root of the result is 4. Find the number.
Answers
Answer: I think 27/2
Explanation:
Let number = x:
√(2x - 11) = 4
Now to get x, we undo the square root by squaring both sides:
[√(2x - 11)]² = 4²
(2x - 11) = 16
2x = 27
x = 27 / 2
Hope this helps!
HELP ME PLZZZ
I really need the help with it
Answers
Tickets to the zoo cost $12 for adults and $8 for children. The school has a budget of $240 for the field trip. An equation representing the budget for the trip is: `240\ =\ 12x+8y`
Select all the true
If no adult chaperones were needed, 30 students could go to the zoo.
If ten students go to the zoo, then 15 adults can go.
If four more adults go to the zoo, that means there will be room for six fewer students.
If two more students go to the zoo, that means there will be room for three fewer adults.
If 16 adults go to the zoo, then 6 students can go.
Answers
Answer:
2 answers are true
Step-by-step explanation:
If no adult chaperones were needed, 30 students could go to the zoo. Is true
If 16 adults go to the zoo, then 6 students can go. Is also true
Look at the right triangle shown below. Which of the folllowing could not be the triangle’s dimensions?
Answers
Answer:
5,12,13
Step-by-step explanation:
The sides are almost close for the distance and so 5 doenst go with 12 and 13, its too small. For dimensions while the other numbers are close to being related. Do you know what I mean?
Hope this helped a little tho!
Find the circumference of a circle whose area
is 38.5 m²
Answers
Answer:
12.41m
Step-by-step explanation:
Well, if we divide by the hypotenuse of the Pythagorean Theorem due to the angle created between the divisions on the scale between the 8th and 7th degree law of the Mathematical Institution of Nigeria, Ghana and Ethiopia (MINGE), then we get the result of 12.41.
Use the distributive property to evaluate the expression
4(9 + 1)
Answers
4(9 + 1)
36 + 4
40
hope this helped
Mr. Gonzalez drove 30 miles in March. He drove 5 times as many miles in March as he did in January. He drove 2 times as many miles in February as he did in January. How many miles did Mr. Gonzalez drive in February?
Answers
Step-by-step explanation:
Given information :
Mr. Gonzalez drove 30 miles in March. In January, she drove 1/5 as much as in March.
30 ÷ 5 = 6 miles in January
in JanuaryShe drove 2 times as many miles in February as she did in January. In January, she drove 30 miles.
6 x 2 = 12 miles in February
WHAT IS X???
1.2/0.96 = 3.0/x
Answers
Answer:
x= 2.4
Step-by-step explanation:
Answer:
2.4 or 12/5
Step-by-step explanation:
1.2/0.96=3/x
convert the decimal into a fraction---- 6/5 /0.96= 3/x
Simplify the complex fraction-----5/4 = 3/x
simplify the equation using cross-mulitpication----- 5 x = 12
divide both sides of the equation by 5--- x= 12/5
Check if the solution is in the defined range
Alternitive form:
x=2 2/5, x =2.4
Which ordered pair would form a proportional relationship with the point graphed below?
40
(-20, 40)
30
20
10
-40-30-20
-20-1901 10 20 30 40
-20
30
140
O (-40, 20)
1-10, -20)
Answers
Which compound inequality could be represented by the graph?
Pls help
Answers
Answer:
I think 3 is right . uihhhujh
d) The permeter of the recthngle shown is 30 inches
Height is 12 Length is 4x-6
Part A Write & solve an equation to find the vale of x
Equation
Solve and answer
Part B What is the area of the rectangle?
Answers
Answer:
Step-by-step explanation:
P = 2(w + l)
A = lw
~~~~~~~~~~~~~
Part A:
2[(4x - 6) + 12] = 36
8x- 12 + 24 = 36
8x = 36 - 12
x = 3
Part B:
A = 6 × 12 = 72 inch.²
Solve the inequality
M + 9 > 6
Answers
Answer:
m>-3
Step-by-step explanation:
6-9 = -3
m>-3
Write the equation of a line perpendicular to y =
3
x-3 and whose y-intercept is (0,12).
Answers
When writing an equation for a line that’s perpendicular, don’t forget to flip the slope to its reciprocal
Answer:
y=-1/3x+12
Step-by-step explanation:
The slope of a line that is perpendicular to another is the negative reciprocal of the first. The slope of the line is 3 so the negative reciprocal will be -1/3.
Using the point-slope formula we can solve for the equation of a line with a slope of -1/3 and a point of (0,12).
The point slope formula is
y-y1=m(x-x1).
y-12=-1/3(x-0) -------------->Distribute: y-12=-1/3x ---------------> Isolate the y by moving the 12 to the other side. y=-1/3x+12
Please Help, the correct answer will get brainliest.
Answers
Answer:
Yes I will help
Step-by-step explanation:
Write an express for the perimeter of the figure shown by combing like terms.
Answers
Answer:
30c + 6 i believe
Step-by-step explanation:
Translate the following sentence into an inequality: Twice a number plus
two is less than the difference of x and six.
Answers
Answer:
hey your really cute thats all
Step-by-step explanation:
;) love you bubs see you someday, now
PLZ I NEED HELP I FORGOT HOW TO DO THIS
Answers
An alarm rings 8 times in 5 seconds.What is the unitr rate,in rings per second?
Answers
Answer: the answer is 1.6
Step-by-step explanation: 8 divided by 5 is 1.6
. -1/11 plus -9/11
Answers
Step-by-step explanation:
the answer is equals to
-10/11
Answer:
-10/11
Step-by-step explanation:
CAN U PLZ HELP THANK YOU
Answers
Answer
second one
Step-by-step explanation:
Cell phone plan a cost 70 per month but gives you a free 500 dollar phone plan b coat 50 dollors but has no phone. How long would it take them to reach the same proce
Answers
Answer:
Number of month = 25 month
Step-by-step explanation:
Given:
Plan A $70 per month and $500 phone cost
Plan B $50 per month No phone
Assume;
Number of month = x
So,
50x + 500 = 70x
20x = 500
x = 25
Number of month = 25 month
Which speed is the fastest? Group of answer choices LaTeX: 4\:miles\:in\:\frac{1}{3}\:hours4 m i l e s i n 1 3 h o u r s LaTeX: \frac{1}{3}\:mile\:in\:4\:hours1 3 m i l e i n 4 h o u r s LaTeX: \frac{1}{2}\:mile\:in\:3\:hours
Answers
Answer:
4 miles in 1/3 houra
Step-by-step explanation:
Which speed is the fastest? Group of answer choices LaTeX:
The formula for speed =
Distance (miles) / Time (hours)
A) 4 miles in 1/3 hours
= 4 / 1/3
= 4 ÷ 1/3
= 4 × 3
= 12 miles per hour
B)1/3 miles in 4 hours
=1/3 miles/4 hours
= 1/3 ÷ 4 miles per hour
= 1/3 × 1/4 miles per hour
= 1/12 miles per hour
C) 1/2 miles in 3 hours
= 1/2 miles / 3 hours
= 1/2 ÷ 3
= 1/2 × 1/3
= 1/6 miles per hour
The fastest speed is A, 4 miles in 1/3 houra
16. An experiment is carried out to determine how different pH values of soil will affect the growth of tomato plants. In this
experiment, the independent variable could be the
1. Type of the tomato plant
2. Amount of soil provided
3. Colour the of tomato
4. Light intensity
Answers
Step-by-step explanation:
2. Amount of soil provided.
In order to give different pH values of the soil, the amount of soil can directly affect this independent variable.