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3x + 4y =-17
3x = -17-4y
#2
x+2y=-7 (semua dikali 3 supaya hasil x jadi 3x)
3x + 6y = -21
-17 - 4y + 6y = -21
-17 + 2y = -21
2y = -21 + 17
2y = -4
y = -2
#3
x + 2y = -7
x + 2 . -2 = -7
x -4 = -7
x = -7 + 4
x = -3