Answer:
y=53
Step-by-step explanation:
the sum of all angles in a triangle is 180 so first you need to figure out what angles you can identify.
by adding 48 and 28 you see that only 76° have been taken so you will subtract 76° from 180 to get 104 now you can start to solve.
1.) a straight angle is equal to 180° so subtract 104 from 180 to get 76 l°
2.) substitute 76° into the equation to get 76=2y-30
3.) work it out
76=2y-30
+30 +30
106=2y
2. 2
53=y
4: check your answer
2(53)-30
106-30= 76
