So for the first question, you basically add up all of the sides. So it would be 3y+5+3y+1+2y+6+2y+3y-4+2y+2y+8+4y-2
To simplify that combine like terms so 17y+14
For the second part of the question, it's easy algebra.
Here's your problem 17y+14=77
To solve that get the variable by itself, subtract the constant, 14, from both sides.
17y+14 -14=77 -14
17y=63
Now divide each side by the coefficient, 17
y=3.71
I might be wrong in my math somewhere, but the method is the same... you might want to check it to make sure.
