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
`(1)/(3)`x + 500

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
`(1)/(3)`. One invitation will cost $3
`(1)/(3)`

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

y = - 3
`(1)/(3)`x + 500

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