Answer:
y=130
Step-by-step explanation:
1) combine all like terms for the inside angles of the triangle
- (3x-19) + (4x+8) + (x+7)
- 3x-19+4x+8+x+7
- 8x-4
2) because the sum of all angles = 180 add that to the sum of all like terms
- 8x-4=180
- add 4 on both sides and divide both sides by 8
- this should be x=23
3) now you replace the x's with 23
4) now we know that (3x-19)=50
5) take 180 and subtract 50
- this is because y and (3x-19) creates a supplementary angle which also equals 180
6) 180-50=130
