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Rashid [163]
3 years ago
8

Solve the system by substitution. -8x – 7y = -5 -x = y

Mathematics
2 answers:
Lapatulllka [165]3 years ago
6 0

Substitute y = -x into the first equation:

-8x - 7(-x) = -5

-8x + 7x = -5

-x = -5

x = 5

Substitute x = 5 into y = -x

y = -(5)

y = -5

Answer: x = 5, y = -5

Inessa [10]3 years ago
5 0

Step-by-step explanation:

-8x -7y + 5 = 0

y = -x

substituting this value, we get:

-8x -7(-x) +5= 0

-8x +7x + 5 =0

-x +5=0

5 = x

substituting this value in the equation, we get:

-8(5) -7y + 5 = 0

-40 -7y +5=0

-35 -7y =0

7y = -35

y = -35/7

y = -5

Follow me please ...thank u :)

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What is equivalent to -1/4y -2 1/4y + 1/2 (4-2y) a) -3y + 2 b) -3 1/2y + 2 c) -4y + 4
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Step-by-step explanation:

Our expression is: \frac{-1}{4} y-2\frac{1}{4} y+\frac{1}{2} (4-2y).

Let's first distribute out that parentheses. Remember that distribution is simply taking the sum of the product of the outside term with each of the inside terms. Here, the outside term is 1/2 and the inside terms are 4 and -2y:

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\frac{-1}{4} y-2\frac{1}{4} y+2-y

We want to combine like terms, which means combining all the terms with y in them:

\frac{-1}{4} y-2\frac{1}{4} y-y+2=\frac{-1}{4} y-\frac{9}{4} y-\frac{4}{4} y+2=\frac{-1-9-4}{4} y+2=\frac{-14}{4} y+2=\frac{-7}{2} y+2

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<em>~ an aesthetics lover</em>

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