if a // b and e // f, what is the value of y?\n87\n88\n91\n92

Explanation:

Step1: Use vertical - angle property

Since vertical angles are equal, we have $(x + 1)=(x - 3)+y$.

Step2: Simplify the equation

Expand the right - hand side: $x + 1=x - 3+y$. Subtract $x$ from both sides of the equation: $1=-3 + y$.

Step3: Solve for $y$

Add 3 to both sides of the equation: $y=1 + 3=92$.

Answer:

92