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2 years ago

Use the substitution method to determine the solution of the system of equations. y = -5x and 21x - 7y = 28

Mathematics

1 answer:

8_murik_8 [283]2 years ago

3 0

Answer:

x = 1/2 y = -5/2

Step-by-step explanation:

Since we already know an equation for y, we just need to plug it into the other equation.

21x - 7(-5x) = 28

21x + 35x = 28

56x = 28

x = 1/2

Now that we know x, we substitute it into the other equation, to find y.

y = -5x

y = -5(1/2)

= -5/2

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The answer is B. 2y+3
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