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3x -2y =25 ....... 2
substitusikan pers 1 ke pers 2
3x - 2(2x-12) = 25
3x - 4x + 24 = 25
-x = 1
x = -1
pers 1
y = 2x-12
y = 2(-1) - 12 = -14
(x,y) = (-1,-14)
y = 2x - 12
Substitusikan pers. y ke dalam pers. 2
3x - 2(2x - 12) = 25
3x - 4x + 24 = 25
-x + 24 = 25
-x = 25 - 24
-x = 1
x = -1
Substitusikan nilai x ke salah satu persamaan
2(-1) - y = 12
-2 - y = 12
-y = 14
y = -14
HP: {-1,-14}