Identifying Functions and Calculating Slope

What is the criterion for a graph to be considered a function?

• It passes the vertical line test.

• It has repeating Y values.

• It has repeating X values.

• It passes the horizontal line test.

Can a mapping be considered a function if one output has multiple inputs?

• No, if it has repeating X values.

• Yes, if each input has exactly one output.

• No, each output must have only one input.

• Yes, if it passes the horizontal line test.

What does a positive slope indicate about a line on a graph?

• The line is decreasing.

• The line is horizontal.

• The line is vertical.

• The line is increasing.

What does a slope of 2/3 indicate?

• For every 3 units up, the line goes 2 units right.

• For every 2 units up, the line goes 3 units right.

• For every 2 units right, the line goes 3 units up.

• For every 3 units right, the line goes 2 units up.

What does an undefined slope indicate about a line?

• The line is vertical.

• The line is increasing.

• The line is decreasing.

• The line is horizontal.

How do you calculate the slope between two points?

• Y2 + Y1 over X2 + X1

• Y2 - Y1 over X2 - X1

• X2 - X1 over Y2 - Y1

• X1 - X2 over Y1 - Y2

What does the slope formula Y2 - Y1 over X2 - X1 help you find?

• The vertical change

• The rate of change

• The horizontal change

• The midpoint

What is the cost per coffee if the total cost for 6 coffees is $30 and for 2 coffees is $12?

• $5.00

• $3.75

• $4.50

• $6.00

If a graph shows a rate of change of 5 miles per hour, what does this tell you?

• The graph is vertical.

• The graph is horizontal.

• The slope of the graph is 0.

• The slope of the graph is 5.

How many customers per hour did the restaurant serve if it served 400 customers in 6 hours?

• 75 customers per hour

• 66.67 customers per hour

• 60 customers per hour

• 50 customers per hour