A rectangle has sides of length 5x - 7 and 2x + 3 centimetres. 2x +3 5x -7 Write down and simplify an expression in terms of x for the perimeter of this rectangle. (a) [3] (b) The perimeter is 90 cm. Form an equation then use it to find the value of x. [2] (c) Hence, calculate the length of the sides of the rectangle. [2]

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.