PLEASE HELP- Which table DOES NOT represent a function?

9/10 divide by -3/15 as a mixed number

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

Need same math paper but the back now i hope your able to read it cleary i need with hw