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5x-2y=10
5x-2(5/2 x-7)=10
5x-10/2 x + 14 = 10
5x-5x+14=10
14=10 ............ jwabn salah x tidak terdefinisi
y=5/2 x - 7
5/2x=y+7
x=2/5 y + 7
x=(2y+14)/5 subtitusi kan ke bawah
5x-2y=10
5((2y+15)/5)-2y=10
2y+15-2y=10
15=10 ........... y tidak terdefinisi