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Use the image and table to answer the 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.

(1 point)
has the better buy for a gallon of gasoline

1 answer

To determine which store has the better buy for a gallon of gasoline, we can compare the price per gallon from both stores at 5, 10, and 15 gallons.

For Store A:

  • At 5 gallons: $20, which is $20/5 = $4.00 per gallon
  • At 10 gallons: $40, which is $40/10 = $4.00 per gallon
  • At 15 gallons: $60, which is $60/15 = $4.00 per gallon

For Store B:

  • At 5 gallons: $18.75, which is $18.75/5 = $3.75 per gallon
  • At 10 gallons: $37.50, which is $37.50/10 = $3.75 per gallon
  • At 15 gallons: $56.25, which 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 (Store B) is less than $4.00 (Store A), Store B has the better buy for a gallon of gasoline.

Therefore, the answer is 2 for Store B.