
Jon S. answered 10/06/20
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The measures of two angles that form a linear pair add up to 180.
so m<1 + m<2 = 180
18x - 1 + 23x + 17 = 180
41x = 164
x = 4
m<2 = 23x + 17 = 23(4) + 17 = 109 degrees