book Maths Puzzle Numerical Ability

can you please help me figue out how to solve by graphing x=y=-1;3x-y=-7

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book Other Question

The area of a rectangular playground enclosed in Southshore Middle School is 600 square meters. The lenght of the playground is 10 meters longer than the width. Find the demensions My question says to solve the equation and check the solution.
square root of m/3=14

Could you help me with this? thanks!