Please help me find the value of y

Answer:
Option C
Step-by-step explanation:
Given set of equations:
We have to find out the expression that can be substituted in order to find the value of y in the second equation.
From equation (i),
Subtract 2y from both sides:
Thus to find the value of y in eqn(ii), we substitute x = -2y+20.
Option C goes correct.