exam Maths Puzzle Numerical Ability

The sum of a number and -11 is 4. Find the number.

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exam Other Question

a rectangle has a length twice its width. A square with the same area has a side 2 units longer than the width of the rectangle. Find the dimensions of the rectangle. Please, please help? I need to solve by graphing:

x - y = 5 x + y = 3
x -2y = 8 x + y = -1