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x=4-2y disubstitusikan kdlm 4x+2y=8
4x+2y=8
4(4-2y)+2y=8
16-8y+2y=8
16-6y=8
-16y=8-16
y=-8/-6
y=1,33
x=4-2y=4-2*1,33
x=1,34
b. 5a-b=3 dan \+b=2
a=2-b. disubstitusikan ke dalam pers 5a-b=3
5a-b=3
5(2-b)-b=3
10-5b-b=3
10-6b=3
-6b=3-10
b=-7/-6
b=1,16
a=2-b
a=2-1,16
a=0,84