Equation practice with supplementary angles (Full video)

Khan Academy

Supporting grades: 7

Description: Given the algebraic expressions that represent a pair of supplementary angles, Sal forms and solves an equation. Created by Sal Khan. We're told that the measure of angle QPR is 2x plus 122. And the measure of angle RPS is 2x plus 22 degrees. We know that this entire angle right over here is 180 degrees.

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