Question

Himpunan penyelesaian dari x+3y=5 dan 3x+y=-1

Answer 1

3x+9y=15
3x+y=-1
8y=16
y=2

x=5-3y
x=5-3.2
x=-1

Answer 2

X+3y=5 *3 3x+9y=15
*1 3x+y=-1
dikurang
8y = 16
y= 16/8 = 2
subtitusi
x+3y =5
x+3.2 =5
x = -1

hp ={-1,2}