Answer:
Step-by-step 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.
