Monday

April 21, 2014

April 21, 2014

Posted by **Jamese** on Sunday, October 21, 2012 at 12:26pm.

- Math -
**Shell**, Sunday, October 21, 2012 at 12:58pmVariables,

X=first, (fixed) rate

y=second, rate(/minute)

t=time of call

z=total cost

Equation,

z=x+((t-1)*y)

Values,

7minutes is $10, 4minutes is $6.40

Plug them in, isolate one variable, set them equal to each other, and solve for the remaining variable,

10=x+((7-1)*y), 6.4=x+((4-1)*y)

10=x+(6*y), 6.4=x+(3*y)

10=x+(6*y), 6.4=x+(3*y)

-6y= -6y, -3y= -3y

10-6y=x, 6.4-3y=x

10-6y= 6.4-3y

-6.4=-6.4

3.6-6y=-3y

+6y=+6y

3.6=3y

(3.6)/3=(3y)/3

1.2=y

pick one original equation, plug in your new value, and solve for the remaining variable

10-6y=x

10-6(1.2)=x

10-7.2=x

2.8=x

Fixed first minute is $2.80, with $1.20 per each additional minute

I gave you the equations so that you could have them to help you on later problems. And I hope the directions helped.

**Related Questions**

math - A phone compant uses the expression 1.25 + 0.10m to calculate the cost of...

math - a phone call cost $1.25 for the first minute $0.10 for each additional ...

Math - The phone company charges a flat rate of $2.50 plus and additional $0.50 ...

Math - The price of an international call from Detroit to Paris, France, using a...

home economics - Imagine that the efficient provision of telephone calls in a ...

Math/3rd grade - When Joe calls Hank on the phone the call usually last 4 ...

Statistics - Professor does not teach from a book so am not sure how to apply ...

math - Find the cost C for a 10-minute phone call if the cost x for the first 3 ...

geometry - a phone company charges a flat monthly fee of $15 for cell phone ...

Statistics - I have a take home test I am working on. Any help would be ...