Question 1196855


use given data to find linear equation

{{{y=mx+b}}}


if a phone company has a monthly cellular data plan where a customer pays a flat monthly fee of ${{{10}}},{{{ b=10}}}  

and then a certain amount of money per megabyte (MB) of data used on the phone, {{{x}}}

 If a customer uses {{{x[1]=20}}} MB, the monthly cost will be {{{y[1]=11.20}}}. 
If the customer uses {{{x[2]=130}}} MB, the monthly cost will be {{{y[2]=17.80}}}}.

so, we have two points to find a slope


{{{m=(17.80-11.20)/(130-20)=0.06}}}

your equation is:

{{{y=0.06x+10}}}