the solution of a system of linear equations (two straight lines) is graphically represented by the point where the lines intersect.
In this case, as you can see the lines intersect in the point (3 , -2)
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1in = 2.54cm
2in = 1in + 1in = 2.54cm + 2.54cm = 5.08cm
3in = 1in + 1in + 1in = 2.54cm + 2.54cm 2.54cm = 7.62cm
4in = 1in + 1in + 1in + 1in = 2.54cm + 2.54cm + 2.54cm + 2.54cm = 10.16cm
