exam Maths Puzzle Numerical Ability

How is using one,two or three variables to equations different from each other and how are they the same?

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exam Other Question

Solve each of these by graping. Thanks!!!

10. 2x-y=4
2x-y=6

12. x-2y=8
3x-2y=12

I appreciate your help!!!
McGraw Hill 6th edition, chapter 8.1 P=44 units,x+6 (side) x+6 (bottom)

This is my Square Equation

Any help would be greatly appreciated:)