Write a proportion first, change over original, like this: 8 x 16 100 (I got 8 because the difference between 24 and 16 is 8 and I got 100 because percents are out of 100.) Cross multiply 8 by 100 and you get 800. Divide 800 by 16 and you get 50. It changed by 50%
A vertical line is a line that is straight up and down. It will have a constant x value. The x value will be -3 since it passes through the point (-3,-2)
