Question

A jar of mayonnaise holds 30 ounces. When you make a sandwich you use one ounce. Which equation best represents the amount left in the jar?

y = 30x + 1

y = 30x - 1

y = -1x + 30

y = 1x + 30

Answer 1

using one ounce is indicated by a negative one.
let x be the number of times you take out one ounce
You start with 30.
This should help you get the correct equarion

Answer 2

OK. So it should be y = -1x + 30, right?

Answer 3

Yes it sounds right, though it's a strange way to say you used one ounce of mayonnaise. There is no need to have the x.

Answer 4

Thanks!