Divide the coordinates of Q' by the corresponding coordinates of Q to find the scale factor. The multiply the coordinates of R by the same scale factor to find the coordinates of R'.
Q(-3, 4) and Q'(-27, 36)
-27/(-3) = 9; 36/4 = 9 The scale factor is 9.
Now apply the scale factor to the coordinates of R to find the coordinates of R'.
R(-2, -1) ---> R'(-2 * 9, -1 * 9) = R'(-18, -9)
Answer: R'(-18, -9)