Question

The sum of the measures of angle M and angle R is 90°.

Answer 1

X=5

55+(5x+10)=90

(this is a right triangle since all three angles must add up to 180 degrees)

55+5x+10=90
65+5x=90
-65 -65
——————
5x=25

(get the x alone by dividing both sides by 5)

x=5