The phone company splint has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone if a customer uses 290 minutes the monthly cost will be $98.50 if the customer uses 850 minutes the monthly cost will be $238.50 find any equation in the form y equals mx plus be where x is the number of monthly minutes used and why is the total monthly of the splint plan

Cost per minute m=$0.50...The flat fee b=$35

ANSWER: Equation is y=$0.50x+$35

Step-by-step explanation:y=total cost; b=flat fee, m=cost per minute; x=number of minutes

.  

y=b+mx

.

For x=360 minutes:

$215=b+360m

$215-360m=b

.

For x=800 minutes:

$435=b+800m

$435-800m=b

.  

$435-800m=$215-360m

$220=440m

$0.50=m

.Cost per minute m=$0.50

.

For x=360:

b=$215-360m

b=$215-360($0.50)

b=$215-$180=$35

.

The flat fee b=$35

.

ANSWER: Equation is y=$0.50x+$35

.

answer: 21$

step-by-step explanation:

$42 / $14 = 3   (ratio 3: 1)

$7 x 3 = $21