Question

Use the graph to make a prediction of the number of gallons left in the tank if you drove 250 miles. (Picture is an attachment)

Answer 1

Step 1: Draw a line vertical from 250 on the x-axis
Step 2: Mark the point where this line meets your graph line.
Step 3: Draw a horizontal line from this point to the y-axis.
Step 4: Read off the point.

Alternatively, pick some points from the line, and get the slope, and the equation of the line; from where you can input the x-coordinate, and retrieve the corresponding y-coordinate.