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a. Define variables for the measures of the angles
Larger angle = x
Smaller angle = y
b. Write an equation for the measures of the angles.
Since the two angles are supplementary, the sum of the two angles is 180.
x + y = 180
c. Write an equation describing the relation of the measure of the larger angle to the measure of the smaller angle.
x = 2y
d. solve the system formed by the two equations.
x + y = 180
x = 2y
2y + y = 180
3y = 180
y = 60
x = 2y
x = 2(60) = 120
e. What are the measures of the angles
x(larger angle) = 120, y(smaller angle) = 60
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