exam Maths Puzzle Numerical Ability

How to slove {y=-x+3}{y=3/2x-2}

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exam Other Question

The length of a field is equal to 120m more than its width. If the pèrimètre (distance around) equals
560 m, find dimensions of this camp.
Can someone help me on this problem?

I need to rewrite the following equation as a function of x.

-3x + 4y = 11

Thanks so much,
Sher