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1/2x + y = 2 1/2 | x4| 2x + 4y = 10 (eliminasi)
3x - 4y = -5 | x1| 3x - 4y = -5 -
5x = 5
x = 1
Lalu, substitusikan x ke salah satu persamaan
3x - 4y = -5
(3.1) - 4y = -5
4y = -5-3
4y = -8
y = -2
Himpunan dari penyelesaian itu adalah {1,-2}
p = 1 q = -2
Nah jadi, p+q = -1
3x - 4y = -5 (×1) 3x - 4y = -5 +
5x = 1
x = 1/5
disubtitusikan :
1/2x + y = 3/2
1/2 × 1/5 + y = 3/2
1/10 + y = 3/2
y = 3/2 - 1/10
y = 14/10
p + q = 14/10 + 1/5
=1 3/5