Answer:
Casey's monthly payment is $150.
Anita's monthly payment is $230.
Explanation:
Part A:
The system of equations that describes this situation is:
a + c = Total monthly bill
a = c + 80
where a represents Anita's monthly payment, c represents Casey's monthly payment, and Total monthly bill represents the combined bills of Anita and Casey.
Part B:
To solve the system, we can substitute the second equation into the first equation and get:
(c + 80) + c = Total monthly bill
Simplifying this equation, we get:
2c + 80 = Total monthly bill
We also know that over the course of 4 months, their combined bills are $1,520. So we can write:
4(Total monthly bill) = 1520
Substituting the equation for Total monthly bill from the previous step, we get:
4(2c + 80) = 1520
Simplifying this equation, we get:
8c + 320 = 1520
Subtracting 320 from both sides, we get:
8c = 1200
Dividing both sides by 8, we get:
c = 150
So Casey's monthly payment is $150. To find Anita's monthly payment, we can use the second equation from Part A:
a = c + 80
a = 150 + 80
a = 230
Therefore, Anita's monthly payment is $230.