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22-04-2020
Mathematics

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Solve the system of equations using the substitution method.
-3x - y = 15
y = -8x

Respuesta :

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22-04-2020

Answer:

x = 3, y = -24

Step-by-step explanation:

-3x - y = 15

y = -8x

Substitute the value of y into the first equation.

-3x - (-8x) = 15

-3x + 8x = 15

5x = 15

x = 3

Put the value of x into the second equation.

y = -8 * 3

y = -24

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