Originally Posted by Paulotron
Thus,
Hello.
I have this question.
one company charges a standing charge of 15 per quarter, with a cost of 9 per unit used, whereas another companycharges 10.5 per quarter, with a cost of 11 per unit.
find out which number of units makes the cost of each company the same.
The first company chargesOriginally Posted by Paulotron
for x units per quarter.
The second company charges
for x units per quarter.
We need a number of units x that makes both of these expressions equal.
You can do this in several ways. You can graph both cost functions and see for what value of x they intersect.
The other way is algebraic. We have two equations for which we are setting the x and y values to be equal. Since the y values are equal we have:
for some value of x. Solve this equation for x and you have your answer.
-Dan