Question 921331

there is ${{{45}}} monthly fee-this is constant value

there are charges ${{{0.15}}} for every text message he sends or receives

 Sam budgets ${{{80}}} a month for his cell phone

find: how many text messages  can he send or receive each month

let text messages be {{{x}}} 

charges  for text messages are: ${{{0.15*x}}}

total budget  ${{{80}}} should be equal to ${{{0.15*x}}} plus ${{{45}}} monthly fee

set up equation:

{{{80=0.15*x+45}}} ..........solve for {{{x}}}

{{{80-45=0.15*x}}} 

{{{35=0.15*x}}} 

{{{35/0.15=x}}} 

{{{3500/15=x}}} 

{{{233.3333333333333=x}}} 

{{{233=x}}} ...text messages can he send or receive each month