exam Maths Puzzle Numerical Ability

|x-4y|=8 solving for X&Y by graphing

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exam Other Question

Hello I am not sure how to go about this. If the sides of a square are decreased by 3cm, the area is decreased by 81cm^2. What were the dimensions of the original square. I am thinking (x-3)^2=a-81cm^3, but where do I go from here? During basketball season, emily scored 3 more than twice the number of points kayla scored. emily scored 251 points. write an equation that can be used to find the number of points, k. that kayla scored.

(3x)2=251

(3x) squared=251