to examine the ratio y/x (instead of x/y). If the x and y coordinates form proportional relationships, then there is some non-changing number (a constant) that when multiplied times x will create y. In this example, that number is 3 (y = 3x), and is called the constant of proportionality.
C "<span>David’s equation is correct, because their spending will be multiplied by the number of months and then subtracted from their savings"</span> is the correct answer
