bantuin ya kaa.. sama caranya juga

No.5

5x-y=12 × 3 15x-3y=36
2x-3y=10 × 1 2x-3y= 10 -
13x=46 = x=26/13=2

subs x ke pers 2
2x-3y=10
2.2-3y=10
4-3y=10
-3y=10-4
y=6/3
y= -2

8x+5y=8.2+5.(-2)=16-10=6 (E)