Question

Solve the system by substitution -4-y=17 and 4y=x

Answer 1

x = -84

y = -21

Explanation:

4 - y = 17

4y = x

Use the first equation to solve for y

4 - y = 17

y = 4 - 17

y = -21

In the second equation, get y on its own.

4y = x

y = x/4

Substitute the new second equation into the new first equation

-21 = x/4

-21 * 4 = x

x = -84