Evaluating formula functions i really need

x=-2

Explanation:

M=y-y0/x-x0

M=1

y-y0/x-x0=1

y-2/x-0=1

-2/x=1

x=-2

It is all substitution :D

Hope you get it!

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