SOLUTION: A 4-min call cost $2.65 and a 10-min call cost 4.75. What is the linear equation

Question 934348: A 4-min call cost $2.65 and a 10-min call cost 4.75. What is the linear equation

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
given:
A call cost $ and a call cost .
the linear equation: where a number of minutes and a cost, a slope or in your case cost of a call and is y-intercept or in your case any additional fixed cost
if and , then we have
.............eq.1
if and , then we have
.............eq.2
sole this system to find and
.............eq.1
.............eq.2
______________________________..subtract eq.1 from eq.2

go to ......eq.1 substitute for and find

so, your equation is:

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