Question

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

Answer 1

Triangle's interior is 180 degrees in total
$100 + (4y + 25) + (3y + 20) = 180 \\ 100 + 4y + 25 + 3y + 20 = 180 \\ 145 + 7y = 180 \\ 7y = 35 \\ y = 5$
y = 5

Hope this helps.