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3x-4y=-5 ×1 3x-4y=-5 +
5x=5
x=5/5 =1
subs x ke pers 2
3(1)-4y=-5
-4y=-5-3
-4y=-8
y=-8/-4 = 2
x+y= 1+2=3
y=2,5-0,5x...............(1)
3x-4y=-5......................(2)
subtitusikan pers. 1 ke pers. 2
3x-4(2,5-0,5x)=-5
3x-10+2x=-5
5x-10=-5
5x=-5+10
x=1
3x-4y=-5
3-4y=-5
8=4y
y=2
x+y=1+2
=3