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Verified answer
5x - y = 4 |×3x - 3y = 4
maka
15x - 3y = 12
x - 3y = 4
------------------(-)
14x = 8
x = 8 / 14
x = 4 / 7
5x - y = 4
x - 3y = 4 |×5
maka
5x - y = 4
5x - 15y = 20
--------------------(-)
14y = - 16
y = - 16/14
y = - 8/7
hp = ( 4/7 , - 8/7 )
x - 3y = 4
x = 3y + 4 → Subtitusikan ke → 5x - y = 4
5(3y + 4) - y = 4
15y + 20 - y = 4
15y - y + 20 = 4
14y = 4 - 20
14y = -16
y = -16/14 = - 8/7
y = - 8/7 → 5x - y = 4
5x - (-8/7) = 4
5x + 8/7 = 4
5x = 4 - 8/7
5x = 28/7 - 8/7
5x = 20/7
x = 20/7 ÷ 5
x = 20/7 × 1/5
x = 4/7
Himpunan penyelesaian { 4/7 , 8/7 }