Functions - Grade 8

Is the graph shown an example of a function?

• Yes

• No

Is the graph an example of a function?

• Yes

• No

What is the output of the function when the input is 0?

A function is described by the equation $y=-2x+4$ . What is the output when the input is -2? 

The graph represents function A. Function B is represented by the equation $y=2x-3$ . Which best compares the two functions?

• Function A has a greater slope of 7.

• Function A and Function B have the same slope.

• Function B has a greater initial value of -3.

• Function A and Function B have the same initial value.

What is the input of the function when the output is 3?

Which equation describes the function shown in the graph?

• $y=\frac{1}{4}x+3$

• $y=-\frac{3}{4}x$

• $y=-\frac{3}{4}x+3$

• $y=\frac{3}{4}x+3$

Select the equation with a greater rate of change than the function in the graph.

• $y=\frac{3}{4}x+2$

• $y=x+1$

• $y=-2x-3$

• $y=1.5x+7$

Margot is saving up to buy a new car. She has $1,300 saved and is adding $150 to her savings every two weeks. What is the initial value of this situation?

Filipe started a car wash business with a friend. They wrote an equation to describe their profits for the business $y=-450+25x$ , where x is the number of cars washed, and y is the profit. Select the true statement about this situation. 

• Filipe and his friend charge 450 for every car wash.

• Filipe and his friend spent $25 on supplies for their car wash business.

• Filipe and his friend spent $450 on supplies for their car wash business

• Filipe and his friend started with a profit for their car wash business.