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y = 3x - 5
2x + y = 7
Masukkan y ke persamaan,
2x + y = 7
2x + (3x - 5) = 7
5x - 5 = 7
5x = 7 + 5
5x = 12
x = 12/5
x = 2,4
Masukkan x ke persamaan,
2x + y = 7
2(2,4) + y = 7
4,8 + y = 7
y = 7 - 4,8
y = 2,2
Jadi, HP = (2,4 ; 2,2)
No. 2
x = 5 - 2y
y - 2x = 0
Masukkan x ke persamaan,
y - 2x = 0
y - 2(5 - 2y) = 0
y - 10 + 4y = 0
5y - 10 = 0
5y = 10
y = 10/5
y = 2
Masukkan y ke persamaan,
x = 5 - 2y
x = 5 - 2(2)
x = 5 - 4
x = 1
Jadi, HP = (1, 2)