x - 6y = -15 --- (1)
x - 3y = -3 --- (2)
From (2), we have:
x = 3y - 3 --- (3)
Substituting (3) into (1), we will get:
(3y - 3) - 6y = -15
-3y - 3 = -15
-3y = -12
3y = 12
y = 12 / 3
y = 4
Substituting y = 4 into (3), we will get:
x = 3y - 3
x = 3(4) -3
x = 12 - 3
x = 9
Hence, we have x = 9 and y = 4