Question

Janet was given $500 by her grandmother to spend on invitations for her wedding. Three invitations cost $10 to print.Which equation can be used to represent y, the amount of money Janet has left after purchasing x wedding invitations?

Answer 1

Answer: y = - 3 $\frac{1}{3}$x + 500

Step-by-step explanation:

       First, we will start off with y = since y is the amount of money left to spend.

       Next, we see that three invitations cost $10. $10 / 3 = 3 $\frac{1}{3}$. One invitation will cost $3 $\frac{1}{3}$

       Lastly, we will create our final equation in slope-intercept form:

y = - 3 $\frac{1}{3}$x + 500

      Side Note: We also could write something like y = -10($\frac{x}{3}$) + 500 if we did not want to change the cost.