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2. Audrey charges a flat fee of $4 for each delivery plus a certain amount, in dollars permile,for each mile she drives. For a distance of 30 miles, Curtis and Audrey charge the sameamount. How much does Audrey charge, in dollarspermile? Show or explain all your work

Respuesta :

I will assume that Curtis charge $3.70 per mile

so

Let

y -----> the total charge

x -----> the number of miles

we have that

Audrey's equation

y=ax+4

where a is the amount that Audrey charge per mile

Curtis equation

y=3,70x

we know that

For a distance of 30 miles the charge is the same in both equations

so

ax+4=3.70x

For x=30

30a+4=3.70(30)

Solve for a

30a+4=111

30a=111-4

30a=107

a=3.57

that means -----> Audrey charge $3.57 per mile