Question

find the value of y.

Answer 1

I don't feel like working it out/ maybe someone will give you the answer/ but basically you would set
$(3y + 1)$
and add it to
$(8x - 61)$
to equal 180( which is the degree of a line
so it looks like this:
$(3y + 1) + (8x - 61) = 180$
and then solve( tell me if you need more clarification)

Answer 2

8x-61 = 6x-13

Move Variable Term

8x-61= 6x-13

-6x       -6x

2x-61= -13

   +61  +61

Move Constant Term

2x=48

Undo Multiplication with division

48/2= 14   x=14

3y+1+8x-61=180

Combine Like terms

3y+8x-60=180

Move Constant Term(add 60)

3y+8x=140

Move Variable Terms

140/8=17.5

17.5/3= 5.83333333