the interor angles of a triangle have measures 100 degrees 4y+25 degrees and 3y+20 degrees whats the value of y

y = 5

Step-by-step explanation:

The 3 interior angles of a triangle sum to 180°

Sum the 3 given angles and equate to 180

100 + 4y + 25 + 3y + 20 = 180 ← simplify left side

7y + 145 = 180 (subtract 145 from both sides)

7y = 35 (divide both sides by 7)

y = 5