Question

Zahn takes a summer job selling ice cream bars at the pool. He receives a fixed salary and then additionally a commission for each ice cream bar he sells. The table shows Max's total earnings, y, in dollars, from selling x ice cream bars:

Ice Cream Sales and Earnings
Number of Bars Sold (x)
Total Earnings (dollars) (y)
0
30
1
34
2
38
3
42
Select the equation that best represents the relationship between x and y. (5 points)


a
y = x + 34


b
y = 4x + 30


c
y = 4x + 42


d
y = x + 42

Answer 1

Answer: B

If you look at the table, you notice that he earns 30 without selling ice cream bars. This is his fixed salary.

When he sells one ice cream bar, he earns 34, which means he gets 4 dollars for each bar he sells.

The equation that best represents the relationship between x and y is b) y = 4x + 30, because 4 dollars × number of ice cream bars + fixed salary equals his total earnings.