Exercise 19 Page 212

We are given the coordinates of triangle $PQR$ and we want to find its image after a dilation. The first step will be graph $△BCD$ with the given vertices: $B(\text{-}5,\text{-}10),$ $C(\text{-}10,15),$ and $D(0,5).$

A dilation can be an enlargement, a reduction, or the same size as the preimage. Which type of dilation it is depends on the value of the scale factor $k.$