Answer:
x = -3
y = -3
Step-by-step explanation:
4x - y = -9 -------eqn 1
3x - 3y = 0 ---------eqn 2
From eqn 1, make y the subject of the formula
4x - y = -9
4x + 9 = y
y = 4x + 9
Substitute y into the eqn 2
3x - 3y = 0
3x - 3(4x + 9) = 0
3x - 12x - 27 = 0
-9x - 27 = 0
-27 = 9x
-27/9 = 9x/9
-3 = x
x = -3
Substitute x into the eqn 1
4x - y = -9
4(-3) - y = -9
-12 - y = -9
-12 + 9 = y
y = -3
The values are
x = -3
y = -3
