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x+y=7
2x =2
x=1
x-y=-5
1+5=y
6=y
2x+y=4 .....(1)
3x+y=5 .....(2)
Restando:(2)-(1)
x=1
2x+y=4
2(1)+y=4
2+y=4
y=2
x+4y=14 ....(1)
x-3y=-7 ....(2)
Restando:(1)-(2)
7y=7
y=1
x+4y=14
x+4(1)=14
x+4=14
x=10