exam Maths Puzzle Numerical Ability

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The length of a rectangle is twice its width. If the area of the rectangle is 162m2 , find its perimeter.

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solve by addition if a unique solution does not exist state whether the system is inconsistent or dependent.

-3x+y=8
3x-2y=-10

thanks so much for the function y= 1/x-2 give the values y for x = -1,0,1,2,3,4

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using these points draw a curve