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y = 3x +6
y = -2x +11
maka :
3x +6 = -2x +11
3x +2x = 11 -6
5x = 5
x = 1
y = 3x +6
y = 3(1) +6
y = 3 +6
y = 9
Jadi, selesaiannya adalah {(1,9)}.