Question

The table shows the number of minutes Jalen talks on his mobile phone and the cost of the phone calls. Jalen’s Mobile Phone Cost Number of minutes, x 150 220 250 275 Cost, y $7.50 $11.00 $12.50 $13.75 If the cost varies directly with the number of minutes Jalen talks on the phone, which equation represents the variation?

Answer 1

From the listed options, it's A) y= 0.05

Like this if it helps-hope it does

Answer 2

Answer:

$y=0.05x$

Step-by-step explanation:

Given :

x                    Cost, y  

150               $7.50  

220              $11.00

250              $12.50  

275              $13.75

To Find: If the cost varies directly with the number of minutes Jalen talks on the phone, which equation represents the variation?

Solution:

To find equation we will use two point slope form.

$y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)$

$(x_1,y_1)=(150,7.50)$

$(x_2,y_2)=(220,11.00)$

Substitute the values in the formula.

$y-7.50=\frac{11-7.5}{220-150}(x-150)$

$y-7.50=0.05(x-150)$

$y-7.50=0.05x-7.50$

$y=0.05x$

Hence the equation which represents the variation is   $y=0.05x$