Linear equations

[Helina.07]

The monthly cost, in dollars, for a cellphone plan is given by the equation C=0.15t + 20, where t is the time, in minutes, spent calling long distance. Describe this plan with a table of values and a graph

 

[mmm4444bot]

Hello Helina. Have you chosen any time values and substituted them for variable 't' in the formula for cost 'C'?

For example, what values do you get for C, using the following time intervals (measured in minutes)?

t = 5
t = 10
t = 15
t = 20
t = 25
t = 30

Please share any work that you've already tried. Thank you!

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[EncyclopediaWizard]

The monthly cost, in dollars, for a cellphone plan is given by the equation C=0.15t + 20, where t is the time, in minutes, spent calling long distance. Describe this plan with a table of values and a graph

Since you have the equation: C = 0.15t + 20,
Substitute different values of t into the equation to work out C for each value.
Plot a table like this:

C	t

Since the equation is in the form C = mt + 20 (Y = mX + C), plot a graph with C as the Y-axis and t as the x-axis