describes a horizontal line
so slope = 0
you have to subtract the x's and then then the y's, y is always on top. so, y=2-2/ x= 7-5 making 0/2 when the 0 is on the "top" of the fraction, that would mean that the two y-values are the same.
there is a 40% chance that the randomly selected child will have a speaking part.
check the picture below.
make sure your calculator is in degree mode.
(7,2) and (5,2)...