Exam 3: Linear Equations With Two Variables

Determine whether the following relation is a function. The input is the number of children in the family and the output is the number of females in the family.

Find the x -intercept and the y- intercept of the equation .

Atmospheric pressure (measured in atm) decreases by 11.5% for every 1000-meter increase in elevation. At sea level the atmospheric pressure is 1 atm. What is the 8000-meter decay factor for the atmospheric pressure (rounded to the nearest thousandth)?

The temperature increases from 6:00 A.M. onward. Let the input t represent the time of the day and let the output F represent the temperature in degrees Fahrenheit. At 6:00 A.M. ( ) the temperature is . At 1:00 P.M. ( ) the temperature is . Find the linear relationship between t and F.

The number of people infected with the H1N1 virus as a function of time (in months) was originally modeled by . Based on new data this model was updated to . What conclusions can be made based on the revised model?

Find the slope of the line that goes through the points and .

Determine whether the graph represents a function.

The graph of the equation will be which of the following?

Find the y- intercept of the equation .

Find the slope of the line given in the graph.

The number of ants in a colony at time t (in days) is modeled by . What is the one-week growth factor for the number of ants (rounded to the nearest hundredth)?

Determine whether the graph represents a function.

Use the graph to find the equation of the line. Put the answer in form.

Find the equation of the line perpendicular to passing through the point .

Find the slope of the line given in the graph.

The number of bacteria present in a Petri dish at time t (in minutes) is modeled by . Which one of the following models the population for a one-hour growth factor?

Use the equation to create a table of nine or more points and graph them. Connect the points with a smooth curve. Clearly label and scale the axes.

State which line has the greater slope.

The amount of credit card debt that you have can be estimated by the equation where D is credit card debt in dollars m months after you start paying off the credit card. Find and interpret the D- intercept for this equation.

The number of people infected with the H1N1 virus as a function of time (in months) was originally modeled by . Based on new data this model was updated to . What conclusions can be made based on the revised model?