When making a telephone call using a calling card, a call lasting 5 minutes cost $0.95. a call lasting 13 minutes cost $1.75. let y be the cost of making a call lasting x minutes using a calling card. write a linear equation that models the cost of making a call lasting x minutes.

a. y = 10x - 981/20
b. y = -0.1x + 1.45
c. y = 0.1x + 0.45

We are basically searching for the equation of the line

(y-yo) = m*(x - xo)

Where,

m is the slope of the line

(xo, yo) is an arbitrary point that belongs to the line

The slope can be found with the points given in the problem

(x1,y1) = (5 min , $0.95)

(x2,y2) =  (13 min , $1.75)

m = (y2 - y1) / (x2 - x1)

m = ($1.75 - $0.95) / (13 min  - 5 min)

m = 0.8/ 8 = 0.1 $/min

(y-0.95) = 0.1*(x - 5)

y = 0.1*x + 0.45

Option C

you can't solve x because it is 2 linear equation and you only have one equation

the answer would be d.

step-by-step explanation:

move all variables to the left side and all constants to the right side

(x−3)^2+(y−1)^2=16

this is the form of a circle. use this form to determine the center and radius of the circle.

( x − h ) 2 + ( y − k ) 2 = r 2

match the values in this circle to those of the standard form. the variable   r   represents the radius of the circle,   h   represents the x-offset from the origin, and   k   represents the y-offset from origin.

r = 4

h = 3

k = 1

the center of the circle is found at   ( h , k ) .

center:   ( 3 , 1 )

these values represent the important values for graphing and analyzing a circle.

center:   ( 3 , 1 ).

radius:   4