It might be easier to match the equations with the tables!
(1) y = x means the x numbers and y numbers are equal. No table shows this, so (1) is not an answer.
(2) Multiply each x by 3 then subtract 1. Table d. matches this.
(3) Raise 2 to the x power, then multiply by 4. Table a. matches this.
(4) Square each x. No table matches this.
(5) Square, then take the opposite. No table matches this.
(6) Square each x, then add 3. Table c. matches this.
