Answer:
We can use the y axis for the cost of each popcorn.
We can use the x axis for the cost of each drink.
For the y-axis, it can be in increments of 5 since that's the unit cost for each popcorn.
For the x-axis, it can be in increments of 2.5 since that's the unit cost for each drink.
Remember you need to add both value because she only has $30.
Explanation: