The correct option is C Step 3
Given inequation is y + 3 ≥ 11
To find which is step is the error, we have to check the given value is true or not.
Substituting the given value y = 9 in the LHS of the inequation, we get:
y+3=9+3=12
So,
LHS = 12
RHS = 11
∴ LHS ≥ RHS
But in the Step 3, it is given in the opposite way.
Hence, Step 3 is incorrect.