Sending text messages from katrina's cell phone costs $0.19 per text message. from last month, she has a credit on her bill for
$9.50. how much more money will she need to pay for text messages this month if she has sent 158 messages?

Katrina will have to pay $21.02 this month.

Step-by-step explanation:

The cost per text message = $0.19

Last month credit = $9.50

The number of text messages sent this month = 158

So, the total cost of 158 texts = 158 x cost per text

= 158 x $0.19  = $ 30.52

So, her total bill = The amount spent on texts - The credit amount

                            = $ 30.52 - $9.50 = $21.02

So, Katrina will have to pay $21.02 this month.

the solution is the point

step-by-step explanation:

we have

> equation a

> equation b

adds equation a and equation b

substitute the value of x in equation b to find the value of y

the solution is the point