exam Maths Puzzle Numerical Ability

f(x)=7/5-x having trouble solving this question

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exam Other Question

2a+2b=? 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