You can
put this solution on YOUR website!let x = "first angle"
"The second angle of a triangle is 4 times as large as the first" ___ 4 * x = 4x
"The third angle is 80 degrees more than the sum of the other two angles" ___ x + 4x + 80 = 5x + 80
x + 4x + 5x + 80 = 180
10x + 80 = 180 ___ 10x = 100 ___ x = 10
second angle is 4 * 10 or 40