book Maths Puzzle Numerical Ability

I dont understand how to solve a problem that states : Find the area of a rectangle with L=2x+3 and W = x-2

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book Other Question

Write an equation in slope-intercept form of a line that passes through the points, (2, -2) and is perpindicular to the graph of x+5y=6 iF x varies inversely as y^2 and x=3 when y=24, find x when y=6