exam Maths Puzzle Numerical Ability

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

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exam Other Question

Factor each polynomial, if possible cannot be factored ,write prime.

-49r^2+4t^2

and

4c^2-5d^2

If someone could help me with these two i think i can do the rest of my How is using one,two or three variables to equations different from each other and how are they the same?