let me change this equation up a bit...
x - 4y = -16....same as ur equation in the problem...just a different form
now its just a matter of subbing
when y = 5
x - 4(5) = -16
x - 20 = -16
x = -16 + 20
x = 4
so the first space on ur table above the 5 is 4
no need to go further...answer B