Angle T and Angle R are vertical angles, which means they are congruent (equal in measurement)
Use substitution to go from Angle T = Angle R to 3x+36 = 6x-9
Now let's solve for x 3x+36 = 6x-9 3x+36-3x = 6x-9-3x 36 = 3x-9 36+9 = 3x-9+9 45 = 3x 3x = 45 3x/3 = 45/3 x = 15
Since x = 15, we can say, Angle T = 3x+36 Angle T = 3*x+36 Angle T = 3*15+36 ... x is replaced with 15 (since x = 15; found above) Angle T = 45+36 Angle T = 81
