Question

Julia is riding in a hot-air balloon. The hot-air balloon descends at a constant rate. One second after Julia started her descent, she was at an altitude of 950 feet. Eight seconds after beginning her descent, Julia was at an altitude of 250 feet.

Which line, on the coordinate grid, correctly displays the altitude of the hot-air balloon as it changes over time?

Answer 1

Line B

Explanation:

You want to choose the line on the graph that goes through points (1, 900) and (8, 250).

Graph

The points of interest (1, 900) and (8, 250) are colored blue on the graph. The blue line through them represents the graph of Julia's altitude as it changes over time. That line is Line B.

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Additional comment

The problem statement and the graph both tell you the point coordinates are (time, altitude), where time is in seconds and altitude is in feet. Then an altitude of 900 feet at a time of 1 second is represented by the coordinates (1, 900). Similarly, an altitude of 250 feet at a time of 8 seconds is the point (8, 250).