Which of the following graphs doesn't not represent a function

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

You are making a blueprint of your bedroom and you plan to use a scale factor of 18 . the actual width of your room is 14 feet and the actual length of your room is 16 feet. determine the width and length of your room on the blueprint. on the blueprint, your room will have a width of feet and a length of feet.

Anyone know? will mark brainliest if correct!