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5x+y=7 -->y=7-5x .......substitusikan ke (1)
3x-2(7-5x)=12
3x-14+10x=12
13x=12+14
13x=26
x=2
y=7-5x
y=7-5(2)
y=7-10
y=-3
titik potongnya: (2,-3) dg demikian p=2 dan q=-3
4p+3q=4(2)+3(-3)
4p+3q=8-9
4p+3q=-1