i need help with this question for algebra

Question

One angle in a triangle has a measure that is three times as large as the smallest angle. The measure of the third angle is 50 degrees more than that of the smallest angle. Find the measure of the LARGEST angle.

Answer 1

A = 3S

B = 50+S

A+B+S = 180

3 equations 3 unknowns, solve by substitution elimination, or matrix algebra

3S +50+S + S = 180

5S = 130

S = 26 degrees = Smallest angle

A = 78 degrees

B = 76 degrees