Question 70989
For Jim's brakes use the equation: {{{y=25+55x}}} and for Myron use {{{y=40+30x}}}
To find out when they will cost the same, set the two equations equal to each other (in other words set the two unknown prices equal to each other) 
{{{25+55x=40+30x}}}Solve for x (the time)
{{{25x=15}}}
{{{x=15/25}}}
{{{x=3/5}}}So at 3/5 of an hour or at 36 minutes they will cost the same