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substitusi x
5(3y+9)+2y=11
15y+45+2y=11
17y=-34
y=-2
substitusi x
x=3(-2)+9
x=-6+9
x=3
5x + 2y = 11...(2)
dari pers (1)
x-3y = 9
x =3y+9
subtitusi nilai (x) ke pers (2)
5x + 2y = 11
5(3y+9) + 2y = 11
15y + 45 + 2y = 11
17y = 11 - 45
17y = -34
y =-2
subtitusi nilai (y) ke pers (1)
x-3y = 9
x - 3(-2) = 9
x + 6 = 9
x = 9 - 6
x = 3
maka himpunan penyelesaian dari
x-3y = 9
5x + 2y = 11
adalah {3, -2}
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