exam Maths Puzzle Numerical Ability

lines a and b are perpendicular. The slope of line a is given. What is the slope of line b?

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exam Other Question

A square and a rectangle have the same area. The length of the rectangle is 8 in. more than a side of the square, and the width of the rectangle is 4 in. less than a side of the square. Find the length of a side of the square. COMPLETE 1300CM^2__________M^2