Question 322310
The cost for each trip is the sum of a base rate plus a variable amount based on mileage
{{{210 = BaseRate + 625*CostPerMile}}}
{{{133.5 = BaseRate + 370*CostPerMile}}} subtract this equation from the one above
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{{{210-133.5 = 0 + (625-370)*CostPerMile}}}
{{{76.5 = 255*CostPerMile}}}
{{{76.5/255 = CostPerMile}}}
{{{0.3 = CostPerMile}}}

Using this variable rate, go back and solve for the BaseRate
{{{210 = BaseRate + 625*0.3}}}
{{{210 = BaseRate + 187.5}}}
{{{210 - 187.5 = BaseRate}}}
{{{22.50 = BaseRate}}}

Check your answer
Does
{{{133.5 = 22.50 + 370*0.3}}}???

Get it??