Question

Ed’s rental charges a flat fee of $5 plus $2 per hour to rent a pair of skates.


A. Write an equation to model the cost of renting skates, y, for x hours.




B. Graph the equation. Label the y-intercept.



C. Use the graph to find the cost for renting the skates for 2 hours. Show the details on your graph above.

What is the cost?

Answer 1

A.

Flat doesn't change

2 changes with x

y = 2 x + 5

B.

y-intercept is a point on the graph where x is zero.

y = 2 * 0 + 5 = 0 + 5 = 5

x = 0 , y = 5


x-intercept is a point on the graph where y is zero.

2 x + 5 = 0

2 x = - 5

x = - 5 / 2 = - 2 .5

x = - 2.5 , y = 0


Draw Cartesian coordinate system.

Mark point x = - 2.5 , y = 0 and point x = 0 , y = 5 and draw sraigth line.

Label point x = 0 , y = 5 like y-intercept


C.

In point x = 2 draw a vertical line.

Find point where this vertical line toucing graph.

y coordinate of this point is the cost for 2 hours.

The cost = $9