Solve the system of equations using the substitution method.

-3x - y = 15

y = - 8x

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