-4x + 7y = 18
4x - y = -3
solve using either the substitution or elimination method
pls show solving steps
will mark brainliest
Answers
Answer:
Step-by-step explanation:
Subtract 7y7y from both sides.
-4x=18-7y−4x=18−7y
2 Divide both sides by -4−4.
x=-\frac{18-7y}{4}x=−
4
18−7y
Related Questions
A school wants to buy some new desks and chairs. If it buys 40 desks and 100 chairs, the
total cost is $1100; if it buys 50 desks and 80 chairs, the total cost is $1150. What is the
price of a desk and a chair
Answers
Answer: The price of desk is 15 and the price of the chairs 5
Step-by-step explanation:
what is 3*5 plesase helllpppp
Answers
Answer:
15
Step-by-step explanation:
pls brainiest
3x3x3x3x3 is 243
Write an inequality for the graph below
Answers
Answer:
y > -1/4x + 4
Step-by-step explanation:
First find the equation of the line itself, which is y = -1/4x + 4, then determine if graph shades above the line or below the line. If it shades above which is true in this case, it will be greater than. If it shades below which does not occur in this case, it will be less than. Because the line is dashed and not solid, it will just be greater than or less than.
Therefore y = -1/4x + 4 → y > -1/4x + 4 [Shades above the line, line is dashed].
Anasia is a basketball player who regularly shoots sets of 2 free-throws. Suppose that each shot has probability
0.7 of being made, and the results of the shots are independent.
The table below displays the probability distribution of X, the number of shots that Anasia makes in a set of 2
attempts.
2
X=of makes 0 1
P(X)
0.09 0.42
0.49
Given that r = 1.4 makes, find the standard deviation of the number of shots that Anasia makes.
Round your answer to two decimal places
shots
Answers
Answer:
0.65
Step-by-step explanation:
The required standard deviation is 0.65
Given data is,
Computation:
[tex]\varepsilon_x\times P(X=x)=0\times 0.09+1\times0.42+2\times0.49\\=0.42+0.98\\=1.4[/tex]
Now,
[tex]E(X^2)=0^2\times 0.009+1^2\times 0.42+2^2\times 0.49\\=0.42+1.96\\=2.38\\\sigma ^2=E(X^2)-(E(X))^2\\=2.38-(1.4)^2\\=0.42\\\sigma =\sqrt{0.42}\\=0.65[/tex]
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PLEASE HELP PIC DOWN BELOW 8th GRADE MATH
Answers
Answer:
A) 1/5 * 10
Step-by-step explanation:
1/5 / 1/10 = Time it will take to fill up
=> 1/5 * 10 = Time it will take to fill up
=> 1*2 = Time it will take to fill up
=> 2 = Time it will take to fill up
If my answer helped, kindly mark me as the brainliest!!
Thanks !!
simplify 4p^5q^3*p^2^-4
Answers
24p+7q
-----------
12
Answer:
[tex]4p^{5q^{3} -2}[/tex]
Step-by-step explanation:
The base would stay the same as nothing is being multiplied.
sam is 12 in four years his age will be 2/3 the age of his cousin like how old will luke be in two years
Answers
Answer:
he will be 17 in
Step-by-step explanation:
Which expression is equal to
(2+2)(1-4)/(3–4)(+4)
Answers
Answer:
48
Step-by-step explanation:
2 + 2 is 4, 1 - 4 is -3, 3 - 4 is -1 and +4 is 4 if you multiply these together, you will get 48.
) A gas station owner finds that for every penny increase in the price of gasoline, she sells 1516 fewer gallons of gas per week. How much more or less gas will she sell if she raises the price by 10 cents per gallon? If she decreases the price by 2 cents per gallon?
Answers
Answer:
a) 15160 gallons
b) 3032 gallons
Step-by-step explanation:
Given that for every penny increase in the price of gasoline there is a decrease of 1516 gallons sold per week
a) when she raises the price by 10 cents per gallon
There will be a decrease of ( 1516 * 10 ) gallons sold per week i.e. = 15160 gallons
b) when she decrease the price by 2 cents per gallon
There will be an increase ( 2 * 1516 ) gallons sold per week i.e. = 3032 gallons
There are 80 pupils in a school. If 32 are boys, what percentage are boys?
Answers
Answer:
40%
Step-by-step explanation:
32/80=.4
Answer:
40%
Step-by-step explanation:
32÷80=.4×100=40%
Please help I needa finish this
Answers
Answer:
i think its d
Step-by-step explanation:
if you look up quadrilaterals you find shapes like rectangles, squares, and diamonds. if you look up parallelograms you find the same thing, so i think it's d. sorry if im wrong i havent done this stuff in a while
Answer:
I am sure the answer is C, if not I'm very sorry
Can sides of a triangle have lengths 3,4,9
Answers
Answer:
yes
Step-by-step explanation:
No, the lengths 3, 4, and 9 cannot form the sides of a triangle.
What is Triangle Inequality?The triangle inequality is a fundamental geometric principle that states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.
We have sides as 3, 4 and 9.
For a triangle to be valid, the sum of the lengths of any two sides must be greater than the length of the third side.
In this case, let's check if this condition is satisfied:
3 + 4 = 7
7 is less than 9
Therefore, these lengths do not satisfy the triangle inequality theorem, and a triangle cannot be formed with side lengths 3, 4, and 9.
Learn more about triangle inequality theorem here:
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a 95 inch board is cut into to pieces. one piece is four times the length of the other. Find the length of the shorter peice
Answers
Answer:
50
Step-by-step explanation:
How many pounds are there in 2/3/4 tons (1 ton = 2000 pounds)
Answers
Really need help on this math question! “Jill is draining her pool before winter arrives.
Initially the pool has 2000 gallons of water.
The pool is draining at a rate of 8 gallons per minute.
Write a function to model this situation.”
Answers
Answer:
f(x)=2000-8x
Step-by-step explanation:
2000 is initial amount that gets subtracted
8x is the amount of gallons being siphoned out, where x is t, or minutes.
Kathy has $50 in her bank account right now. After three
days she had $35 left. What is her rate of change per day?
Think about if she is making or spending money. Just write
the number.
Answers
Answer:
$5
Step-by-step explanation:
After throwing away the rotten tomatoes, did Sheldon get more kilograms of strawberries or tomatoes? How many more kilograms?
Answers
Step-by-step explanation:
since he threw out tomatoes he has more kilograms of strawberries then tomatoes
C С
800.54 + 90.52 =
Answers
Answer: 891.06
Step-by-step explanation:
add 800.54 by 90.52
Geometry... Please help and I'll mark brainliest. Triangle proofs & reasons
Answers
Answer:
See Explanation
Step-by-step explanation:
[tex]\overline{FH} \: bisects \: \angle EHG... (given) \\\\
In\: \triangle FEH \: and\:\triangle FGH\\\\
\angle FEH\cong\angle FGH.. (given) \\\\
\angle EHF\cong\angle GHF\\(\because \overline{FH} \: bisects \: \angle EHG) \\\\
\overline{FH} \cong \overline{FH}...(common)\\ \\
\therefore \triangle FEH \cong\triangle FGH(AAS \: Postulate)
[/tex]
Please help me! thank you!
Answers
Answer:
4
Step-by-step explanation:
Function 1 is moving at a constant rate meaning it has the rate of change of 0/1 or 0.
Function 2 says y is 4x meaning that the rate of change is 4/1 or 4.
0 - 4= I-4I or 4
30 points for anyone that can solve the question
Answers
The solution to this problem is 5/2a^2b^5
Can some one help me with Freshmen Algebra I kinda forgot how to do something and I need a refresher.
Answers
Answer:
Wheres the question?
Step-by-step explanation:
y<2x-15; (7,4)
determine weather the point is a solution of the linear inequality show work
Answers
Answer:
Not a solution.
Step-by-step explanation:
4 < 2(7) - 15
4 < 14-15
4 < -1
Answer:
not a solution
Step-by-step explanation:
Substitute the x- coordinate of the point into the right side of the inequality and compare the result to the left side, that is
2(7) - 15 = 14 - 15 = - 1
Is 4 < - 1 ← no 4 > - 1
Thus (7, 4 ) is not a solution of the inequality
The expression below represents Brianna’s age in
terms of m, Molly’s age.
3m − 5
Which of the following statements must be true?
A Brianna’s age is 3 less than 5 times Molly’s
age.
B Brianna’s age is 5 less than 3 times Molly’s
age.
C Molly’s age is 3 less than 5 times Brianna’s
age.
D Molly’s age is 5 less than 3 times Brianna’s
age.
Answers
Answer: B. Brianna’s age is 5 less than 3 times Molly age.
Step-by-step explanation:
We are informed that the expression below represents Brianna’s age in
terms of m, Molly’s age.
3m − 5.
This shows that 3m simply means that 3 times of Molly's age while the -5 represent less than 5. This will now be:
Brianna’s age is 5 less than 3 times Molly age.
On a Cartesian plane, the horizontal axis is called the _______ -axis and the vertical axis is called the _______-axis.
Answers
Answer:
Step-by-step explanation:
horizontal = x-axis
vertical = y-axis
Hope this helps!
Answer:
Horizontal: X-axis; Vertical: Y-axis
Step-by-step explanation:
HELPPP PLEASEEEEEEEEE
Answers
Answer this please and fast
Answers
Answer:
The 3rd answer because each income has an outcome.
Step-by-step explanation:
Answer:
4th option is correct.
What are the coordinates of the image of point B, after the segment has been dilated by a scale factor of 3 witha
center of dilation at the origin?
(-9. ,9
(9, -9)
Answers
Answer: -9, 9
Step-by-step explanation:
Solve the following inequality.
-3.55g 5-28.4
Which graph shows the correct solution?
3 4
5 6
7
8
9 10 11 12 13
O
3
4 5
6
7
8
9 10 11 12 13
0
3 4
5 6
7
9 10 11 12 13
3 4 5 6
7 8
9 10 11 12 13
Answers
The graph that shows the solutions to the inequality is the last graph.
How to solve the given inequality?
Here we have the inequality:
-3.55g ≤ -28.4
To solve this, we need to isolate g, we can divide both sides by -3.55
g ≤ -28.4/-3.55 = 8
g ≤ 8
Then we must have a black dot at x = 8, and we shade the region to the left of it, meaning that the correct graph is the last one.
If you want to learn more about inequalities:
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Which number is a perfect square? 15 or 4
Answers
Answer:
4
Step-by-step explanation:
even numbers that is a multiple of 4 is a perfect square
Answer: 4 is perfect square.
Step-by-step explanation: