I think what the question is asking is for you to find what 'y' is when x is equal to 1, when x is equal to o and when x is equal to 3.
So first lets start with solve for y when x=1
y + 2(1) = 5
y = 5 - 2
y = 3
So when x = 1, then y = 3
Solve for y when x = 0
y + 2(0) = 5
y = 5
when x = 0, y = 5
Solve for y when x = 3
y + 2(3) = 5
y + 6 = 5
y = 5 - 6
y = -1
when x = 3, y = -1