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2x-1=3x-1
2x-3x=-1+1
x=0
y=0-1
y=-1 jadi perpotonganya di (0,-1)
2. 2x+y-4=0 y=-2x+4
dan 15x-3y=45
15x-3(-2x+4)=45
15x+6x-12=45
21x=45+12
21x=57
x=57/21
x=19/7
y=-2x+4
y=-3(19/7)+4
y=(-57/7)+4
y=-57/7 + 28/7
y=-29/7
perpotongannya (19/7, -29/7)