The graph and the table show the high temperatures in a city over a 10-day period.

1. What was the high temperature on Day 7?

2. On which day(s) was the high temperature 61 degrees Fahrenheit?

3. Is the high temperature a function of the day? Explain how you know.

4. Is the day a function of the high temperature? Explain how you know.

The amount Lin’s sister earns at her part-time job is proportional to the number of hours she works. She earns \$9.60 per hour.

1. Write an equation in the form \(y=kx\) to describe this situation, where \(x\) represents the number of hours worked and \(y\) represents the amount earned in dollars.

2. Is \(y\) a function of \(x\)? Explain how you know.

3. Write an equation describing \(x\) as a function of \(y\).

The graph represents an object that is shot upwards from a tower and then falls to the ground. The independent variable is time in seconds and the dependent variable is the object’s height above the ground in meters.

Coordinate plane, x, time in seconds, 0 to 7 by ones, y, height in meters, 0 to 100 by tens. Graph of a curve begins at (0 comma 10), climbs steeply as it moves right through (1 point 5 comma 75), to (2 point 9 comma 93), then back down through (4 point 5 comma70), to (6 point 1 comma 0).

1. How tall is the tower from which the object was shot?
2. When did the object hit the ground?
3. Estimate the greatest height the object reached and the time it took to reach that height. Indicate this situation on the graph.

The solution to a system of equations is \((6,\text-3)\). Choose two equations that might make up the system.