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3x + 2y = 18
penyelesaian :
x + y = 5 .... (1)
3x + 2y = 18
= 18 - 3x ... (2)
dari persamaan (1)
x + y = 5
x = 5 - y ... (3)
persamaan (3) di subsitusikan ke persamaan (2)
3x + 2y = 18
3 ( 5 - y) + 2y = 18
15 - 3y + 2y = 18
-3y + 2y = 18 - 15
-3y + 2y = 3
-y = 3
y = -3
y = -3
x = 5 - y
x = 5 - 3
y = 2
jadi HP = {2,-3}