5x + 7y = 13 2x - y = 9 dengan cara metode substitusi

2x - y = 9
y = 2x - 9 ... (i)

Subtitusi (i) ke 5x + 7y = 13
5x + 7(2x - 9) = 13
5x + 14x - 63 = 13
19x = 76
x = 4

Subtitusi x = 4 ke y = 2x - 9
y = 2(4) - 9
y = -1

HP : { 4 , -1 }

5x+7y=13
7y=13-5x
y=13/7 -5x/7

2x-y = 9
2x- (13/7 -5x/7 )=9
2x-13/7+5x/7 =9
19x/7-13/7 = 9
19x/7=9+13/7
19x/7 =76/7
19x = 76/7 . 7
19x = 76
x =4

masukkan x=4 kedalam persamaan 2x-y =9
2.4 - y = 9
8-y=9
-y = 1
y = -1


nb : garis miring (/) artinya per ya dek.. ;-*