What is the slope of a line perpendicular to the given line? (-2,4)
|(2, 2)
A) -2
B)-1/2
C)1/2
D) 2

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

the graph on the bottom right