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3x +2y = -3
nilai y = -3x _ 3
2 2
sub:
2x - 5y = -21
2x - 5(-3/2x - 3/2) = -21
2x + 15 x +15 = -21
2 2 x2
4x +15x+15 = -21
19x + 15 =-21
19x = -21-15
19x = -36
x= -36
19
y = -3 (-36/19) _ 3 = 108 _ 3 = 216-114 = 102
2 2 38 2 76 76