exam Maths Puzzle Numerical Ability

Hello
I have another one for you. I have the answer but I cannot remember how I came to have it. Would you be able to help me get there, as I am not certain that it is correct any

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Equations: express it in standard form. Can someone Help me to understand the steps envolved, Thanks!

With m = -1 and y-intercept (0,5) (2,3);(-2,3);(-2,-3);(2,-3).If you join these points ,What will the shape be?My answer is square.