Use the image and table to answer the question. :)

Question

An illustration shows a graph depicting cost of gasoline per gallon in dollars in store A. The horizontal axis shows gallons ranging from 0 to 20 in increments of 5. The vertical axis shows the cost in dollars ranging from 0 to 70 in increments of 10. Four data points are plotted on the graph at left parenthesis 0 comma 0 right parenthesis, left parenthesis 5 comma 20 right parenthesis, left parenthesis 10 comma 40 right parenthesis, and left parenthesis 15 comma 60 right parenthesis. A line connects all the data points.

Store B
Cost of Gasoline per Gallon
Gallons ($) Cost
5 18.75
10 37.50
15 56.25
The proportional relationships between the cost and the number of gallons of gasoline for Store A and Store B are displayed in the graph and table. Which store has the better buy for a gallon of gasoline? Enter 1 for Store A. Enter 2 for Store B.

Answer 1

To determine which store has the better buy for a gallon of gasoline, we can compare the cost per gallon for each store.

For Store A:

• At 5 gallons, the cost is $20, so the cost per gallon is $20 / 5 = $4.00 per gallon.
• At 10 gallons, the cost is $40, so the cost per gallon is $40 / 10 = $4.00 per gallon.
• At 15 gallons, the cost is $60, so the cost per gallon is $60 / 15 = $4.00 per gallon.

For Store B:

• At 5 gallons, the cost is $18.75, so the cost per gallon is $18.75 / 5 = $3.75 per gallon.
• At 10 gallons, the cost is $37.50, so the cost per gallon is $37.50 / 10 = $3.75 per gallon.
• At 15 gallons, the cost is $56.25, so the cost per gallon is $56.25 / 15 = $3.75 per gallon.

Comparing the cost per gallon:

• Store A: $4.00 per gallon
• Store B: $3.75 per gallon

Since $3.75 per gallon (Store B) is cheaper than $4.00 per gallon (Store A), Store B has the better buy for a gallon of gasoline.

Therefore, the answer is 2 for Store B.