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persamaan 1 di kali 3
x + 15 = 2y
x - 2y = - 15
persamaan 2 di kali 6
2y = - 3x + 3
2y + 3x = 3
ga usah di eliminasi, karena nilai sudah ada nilai yg sama yaitu 2y (bisa langsung ilang)
x - 2y = - 15
3x + 2y = 3
--------------------- +
4x = - 12
x = - 3
x - 2y = - 15
-3 - 2y = -15
-2y = - 15 + 3
-2y = - 12
y = 6
( - 3 , 6 ) A