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A cell phone company charges a monthly rate of $12.95 and $0.25 a minute per call. The bill for m minutes is $21.20

a) Write an equation that models this situation.

b) How many minutes were charged on the bill?​

Respuesta :

  • Fixed amount=12.95$=b
  • Rate of change=0.25$ =m

Let minutes be x

Equation in slope intercept form

[tex]\\ \tt\longmapsto y=mx+b=0.25x+12.95[/tex]

Now for second part

[tex]\\ \tt\longmapsto 0.25x+12.95=21.2[/tex]

[tex]\\ \tt\longmapsto 0.25x=8.25[/tex]

[tex]\\ \tt\longmapsto x=33min[/tex]

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