Page 49 - Skema Soalan Sistem Persamaan dan Percubaan Negeri Pahang 4 Titanium
P. 49
Selesaikan persamaan serentak berikut :
9x + 3y – z = 17
4x + 2y – z = 12
x + 8y + z = 38
9x + 3y – z = 17 1 5 x 2 Gantikan y=5 dalam 4 ,
4x + 2y – z = 12 2 ( 5x + y = 5) x 2
x + 8y + z = 38 3 10x + 2y = 10 10x + 11(5) = 55
10 x + 55 = 55
1 + 3 4 – 5 10x = 0
9x + 3y – z = 17 10x + 11y = 55 x = 0
+ x + 8y + z = 38 - 10x + 2y = 10
10x + 11y = 55 4 9y = 45 Gantikan y=5 & x=0 dalam 1 ,
y = 5
9(0) + 3(5) – z = 17
1 – 2
-z = 2
9x + 3y – z = 17
- 4x + 2y – z = 12 z = -2
5x + y = 5 5
