three different solutions for 2x-y=7
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Take y=1
2x-1=7
2x=7+1
2x=8
x=4
first solution (4,1)
Take y= 3
2x-3=7
2x=7+3
2x=10
x=5
second solution is (5,3)
Now take y= -1
2x-(-1)=7
2x+1=7
2x=7-1
2x=6
x=3
Third solution is (3, -1)
2x-1=7
2x=7+1
2x=8
x=4
first solution (4,1)
Take y= 3
2x-3=7
2x=7+3
2x=10
x=5
second solution is (5,3)
Now take y= -1
2x-(-1)=7
2x+1=7
2x=7-1
2x=6
x=3
Third solution is (3, -1)
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