1. A rectangular piece of cardboard has dimensions 30 cm by 20 cm. Strips of width x cm and y cm are cut off the ends, as shown in the diagram, so that the remaining cardboard has an area of 450 cm2. 30 cm 目 y cm 20 cm 450 cm2 I cm a) Find an expression for y In terms of x in the form ax -b y = %3D CX-d'

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