I honestly don't understand this question and I am in dire need of help.

The value of y from the given figure is 5
A bisector is the line that divides a line into two equal parts. From the given diagram, the line WY is bisects XZ.
This shows that WX and WZ is equal to each other. Therefore;
2y+7 = 5y - 8
Collect the like terms
2y - 5y = -8 - 7
-3y = -15
Divide both sides by -3
-3y/-3 = -15/-3
y = 5
Hence the value of y from the given figure is 5
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