STAAR Prep Day 2 - Slope and Y-Intercept

Which statement describes the rate of change of the number of items the worker packed in boxes with respect to the number of minutes the worker has been packing items in boxes?

• The worker packed 8 items in boxes per minute.

• The worker packed 37 items in boxes per minute.

• The worker packed 4 items in boxes per minute.

• The worker packed 15 items in boxes per minute.

Which function best models the data in the table?

• f(x) = 296 - 41x

• f(x) = 337 - 41x

• f(x) = 317 - 38x

• f(x) = 296 - 38x

What is the rate of change of height off the ground with respect to the number of steps?

• 14 in. per step

• 1/7 in. per step

• 7 in. per step

• 1/14 in. per step

Printer ink costs $18.99 per cartridge. The company that sells the ink cartridges charges a flat rate shipping fee of $7.95, no matter the number of cartridges purchased in a single order.

Which linear function models the total cost, t, for a single order of c cartridges?

• c = 26.94t

• c = 18.99t + 7.95

• t = 26.94c

• t = 18.99c + 7.95

What is the slope of the line that contains the points (-2, -2) and (4, 2)?

A customer purchases an electronic device for $650. Each year the value of the electronic device decreases by 30%.

Which statement is true about the graph that represents the relationship between the value of the device in dollars, y, and the number of years, x, since the device was purchased?

• The y-intercept of the graph is 650.

• The y-intercept of the graph is 455.

• The graph has a vertical asymptote at x = 0.

• The graph has a horizontal asymptote at y = 30.

Based on the graph, how does the water level in the tank change over time?

• The water level increases at a rate of 1 m/h.

• The water level decreases at a rate of 0.25 m/h.

• The water level decreases at a rate of 4 m/h.

• The water level decreases at a rate of 1 m/h.

Which equation is best represented by this graph?

Which equation best represents the conversion of degrees Celsius to degrees Fahrenheit as shown in the graph?

The graph of a linear function is shown on the grid. Which function is best represented by this graph?