2x -3y = -7 }
3x +5y= -1 }
Dengan metode subtitusi tentukan himpunan penyelesaian dari sistem persamaan berikut ini
2x-3y=-7 | x3 |
3x+5y=-1 | x2 |
= 6x – 9y = -21
6x + 10y = -2
-1y = -23
y = -23+1
y = -22
2x-3y = -7 | x5 |
3x + 5y = -1 | x3 |
10x – 15y = -35
9x + 15y = -3
1x. = -38
x = -38-1
x = -39
Eliminasi X :
2x-3y=-7 | x3 | 6x-9y = -21
3x+5y=-1 | x2 | 6x + 10y = -2
————————————— –
-19y = -19
y = – 19/-19
y = 1
u/ y = 1, disubstitusi ke pers 1
2x – 3y = -7
2x – 3(1) = -7
2x -3 = -7
2x = -7 + 3
2x = -4
x = -4/2
x = -2
hp : {-2,1}