Let x be the number of calls Erica can make using her Cel-Tel card and y be the number of calls she can make using her MTT card.
The cost of x calls on her Cel-Tel card is $1x, and the cost of y calls on her MTT card is $2y.
Therefore, the system of equations is:
1. $1x = $12 (credit on Cel-Tel card)
2. $2y = $15 (credit on MTT card)
Solving these equations gives:
1. x = 12
2. y = 7.5
Therefore, Erica can make 12 calls using her Cel-Tel card and 7.5 calls using her MTT card.
Erica has $12 credit on her Cel-Tel phone card. It costs her $1 to make a phone call using her Cel-Tel card. Erica also has $15 credit on her MTT phone card. It costs her $2 to make a phone call using her MTT card. Which system of equations can be solved to find the number of calls, x, that Erica can make and have the same amount of money, y, on both phone cards?
1 answer