2. A poster is 15 cm taller than it is wide. It is mounted on a piece of cardboard so that there is a 10 cm border on all sides. If the area of the border alone is 950 cm, what are the dimensions or the poster?
Set up two equations T = how tall W = how wide. T = W + 25 is the first equation 5 × { 2 ( T + 10 ) } + 5 × ( 2 × W ) = 1350 This equation is the total height adding 5 for the top border and 5 for the bottom border. Then multiplying the total height by the width of the border 5, time 2 because there are two sides that are tall Then adding 5 times two widths.
