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Kala can choose plan A or plan B For her long-distance charges. For each plan, cost $10 depends on minutes used per month as shown below.If Kayla makes 250 minutes of long-distance calls for the month which plan cost less?How much less does it cost than the other plan?For what number of long-distance minutes do the two plans cost the same?If the time spent on long-distance calls is more than this amount, which plan cost more?

Kala can choose plan A or plan B For her longdistance charges For each plan cost 10 depends on minutes used per month as shown belowIf Kayla makes 250 minutes o class=


Answer :

To answer the questions of this problem, we must use the graph of it. In the graph, we have:

• the cost (dollars) as the dependent variable y,

,

• the minutes used per month as the independent variable x.

1) If Kayla makes 250 minutes of long-distance calls for the month which plan cost less?

We have x = 250 minutes. Looking at the graph we see that for x = 250 minutes, the values of y are:

• for Plan A: y = $20,

,

• for Plan B: y = $28.

So Plan A costs less than Plan B.

2) How much less does it cost than the other plan?

The difference between the cost of Plan A and B is: $28 - $20 = $8.

3) For what number of long-distance minutes do the two plans cost the same?

To find this value, we must look at the value of x (number of minutes) for which the two lines intersect. From the graph, we see that the lines of Plan A and Plan B intersect for x = 350 minutes.

4) If the time spent on long-distance calls is more than this amount, which plan cost more?

From the graph we see that for x > 350 minutes the line of Plan A is over the line of Plan B, so Plan A costs more than Plan B for x > 350 minutes.

Answers

1) Plan A.

2) 8 dollars.

3) x = 350 minutes.

4) Plan A.

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