let the number of gigs used be g
Runfast:
cost = 25 + 10g
BA&D:
cost = 18+15g
let's see for how many g's the plans are the same
cost of one = cost of the other
18+15g = 25+10g
5g = 7
g = 7/5 = 1.4 gigs
so for 0 gigs over, BA&D would cost $18 vs $25 for Runfast, so
BA&D is the better plan if you stay below 1.4 gigs
and Runfast is better if your use more than 1.4 gigs
Two cell phone companies have different rate plans. Runfast has monthly charges $25 plus $10 per gig of data. B A &D’s monthly charge is $18 plus 15 per gig of data. Your task is to determine under what circumstances each company has the better pricing.
Okay I am trying to do the substitution method for this problem. I found their monthly prices and put them in an equation like it asked.
25+10x-RunFast
18+15x-BA&D
I need help with solving these equations using the substitution method. I got 132-150x for 25+10x, but I am pretty sure that is over the top incorrect. I have no idea how to do this, and help would be really appreciated.
2 answers
thanks:) I totally needed the help!
1 answer