system of equations i think. math test on monday plz help

Question

A triangle has three angles. One is labeled x, one is labeled y, and one measures 84 degrees. Angle y is three times as large as angle x. What is the measures of angles x and y?

Answer 1

sum of angles of a triangle is 180

x + y + 84 = 180

y = 3x

then

x + 3x + 84 = 180

4x = 96

x = 24

y = 3x = 72