Aphone company charges for service according to the formula: c ( n ) = 24 + 0.08 n c ( n ) = 24 + 0.08 n , where n n is the number of minutes talked, and c ( n ) c ( n ) is the monthly charge, in dollars. the rate of change in this equation is: the initial value in this equation is:

The rate of change is 0.08 and the initial value is 24.

Step-by-step explanation:

1. You have the following formula:

2. It has the form of a equation of the line, which is:

Where is the slope, which gives the rate of change and is the y-intercept (The initial value, when )

3. Therefore, the rate of change of the given formula is:

4. And the initial value is:

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

17.08

correct me if i am wrong.