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The interior angles of a triangle have measures 100°,  (4y+25)° , and  (3y+20)° . What is the value of y?
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The interior angles of a triangle have measures 100°,  (4y+25)° , and  (3y+20)° . What is the value of y?

User Jan Derk
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2 Answers

4 votes
Since the sum of all angles of a triangle is 180°
So 100°+4y+25°+3y+20=180°
145°+7y=180°
7y=180°-145°
7y=35°
y=5°
User Marco Fatica
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8.2k points
4 votes
the sum of triangle is 180 degrees and therefore here's what I would do, it should be 5 degrees.
The interior angles of a triangle have measures 100°,  (4y+25)° , and  (3y+20)° . What-example-1
User Tamer
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