Question

Solve for x and y:
x = -2y
x - y = 9

Answer 1

Explanation:

x = - 2y

x - y = 9

You can get y pretty quickly by substituting x from the first equation into the second equation

-2y -y = 9 Combine

-3y = 9 Divide by - 3

-3y/-3 = 9/-3

y = - 3

Now Substitute -3 for y in the top equation

x = - 2(-3)

x = 6 Remember 2 minus' make a plus.