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Glencoe Math: Course 2, Volume 1

GM

Glencoe Math: Course 2, Volume 1 View details

8. Slope

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Exercise 18 Page 80

Can you connect the points with one straight line that passes through the origin?

No, see solution.

Practice makes perfect

Before we begin, let's create a table of values using the information from the exercise.

Number of Sandwiches	1	2	3
Cost ($)	5	9.9	14.25

To know if the data given in the table represents a proportional relationship, let's first plot the points as (x,y) coordinate pairs.

Next, we will connect the points we graphed and extend the line to the y-axis. Recall that the graph of a proportional relationship is a single, straight line in the coordinate plane that passes through the origin.

As we can see, the line passes through the origin, but is not a straight line. Therefore, the cost is not proportional to the number of sandwiches.

Subchapter links

Guided Practice p.76

Independent Practice p.77-78

H.O.T. Problems p.78

Standardized Test Practice p.78-80

Extra Practice p.79

Common Core Review p.80