Solve for y. quickly, timed topic test.

3x=90

x=30

2x+3y = 90

2(30)+3y = 90

60+3y = 90

3y = 30

y = 10

3x = 90°

x = 30°   divided both sides by 3

2x + 3y = 90°

2(30°) + 3y = 90°     substituted x with 30°

60° + 3y = 90°         simplified (multiplied 2 and 30°)

        3y = 30°         subtracted 60° from both sides

          y = 10°         divided both sides by 3

answer: y = 10°

the answer is 31.27mph