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5x-6y= -16 | x3 | ---> 15x - 18y = -48
----------------------- -
43y = 43
y = 1
sub y = 1 ke 3x+5y = -1
3x + 5.1 = -1
3x + 5 = -1
3x = -6
x= -2
6(-2) - 5(1) = -12 - 5 = -17