Answer:
20,500
Step-by-step explanation:
2,500 * 5 = 12,500
33,000 - 12,500 = 20,500
2nd and 4th are functions
an x value in a set of functions can only have one y value. however, a y value can have infinite amount of x values
in the 1st and 3rd set, the x value of -2 has 2 y values
The answer for your specific question is

since <span>the slope-intercept form of a linear equation is </span>

, where

is the slope and

is the Y-intercept value.