Question

The graph below shows the cost, in dollars, of gasoline per gallon of gas.

The graph titled 'Cost of Gasoline' shows 'Gallons of gasoline' from 0 to 9 in increments of 1 along the x axis and 'cost in dollars' from 0 to 30 in increments of 3 along the y axis. There is a slanting line starting from (0, 0) and passing through point A at (7, 21).

Select all of the statements which are correct.
A.
The cost of one gallon of gas is $3.

B.
Point A on the graph represents the cost of 21 gallons of gas.

C.
Point (0, 0) on the graph means no gallons of gas were purchased.

D.
The cost of gas increases by $1 for each gallon purchased.

E.
If 9 gallons of gas were purchased, the total cost would be $27.

Answer 1

Correct statements: A, C, and E.

Reasoning:
- The line passes through (0,0) and (7,21). Slope = 21/7 = 3, so the price is $3 per gallon (A true).
- (0,0) means 0 gallons and $0 cost (C true).
- For 9 gallons cost = 9×3 = $27 (E true).
- B is false (A is (7,21), cost $21 for 7 gallons, not 21 gallons). D is false (cost increases $3 per gallon, not $1).