# Chapter 1 - Section 1.4 - Angles and Their Relationships - Exercises: 15a

x + y = 90

#### Work Step by Step

Since $\angle$1 and $\angle$2 are complementary; m$\angle$1 + m$\angle$2 = 90. Substitute in x for $\angle$1 and y in for $\angle$2. x + y = 90.

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