Question

The sum of the angle measures of any triangle is

180 degrees. Suppose that one angle in a triangle has a degree measure of 2x+3
and another has a degree measure of 5x+1. Write an expression for the degree measure of the third angle in the triangle.

Answer 1

let's say that y is the unknown
180=2x+3+5x+1+y
180=7x+4+y
180-7x-4=y
176-7x=y=third angle