SOLUTION: The angle measures of a triangle are 2y + 3 degrees, 9y − 7 degrees, and 7y + 4 degrees. Which of the following is not one of the angle measures of the triangle?
A. 23°
B
Algebra.Com
Question 1081238: The angle measures of a triangle are 2y + 3 degrees, 9y − 7 degrees, and 7y + 4 degrees. Which of the following is not one of the angle measures of the triangle?
A. 23°
B. 74°
C. 83°
D. 97°
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
D is not one of your angles.
-----------------------
Proof:
2y + 3 + 9y − 7 + 7y + 4 = 180 (the three angles of EVERY triangle sum 180)
Group like terms
2y+9y+7y+3-7+4 =180
18y = 180
y = 10
Substitute y with 10 in the equations above to get your answers:
2(10)+3 =
9(10)-7 =
7(10)+4 =
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