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3x - 4y = 14 | 5x | 15x - 20y = 70 -
11y = -22
y = -2
Substitusikan y = -2 ke persamaan 5x - 3y = 16
5x - 3(-2) = 16
5x + 6 = 16
5x = 16 - 6
5x = 10
x = 10
5
x = 2
x=a dan y=b
2.(-2) = -4