Answer:
$6 for a 1-minute call
Step-by-step explanation:
For duration "d" the costs of the plans are identical when ...
5 +1d = 1 +5d
4 = 4d . . . . . . . . add -1-1d to both sides
1 = d . . . . . . . . . divide by 4. Duration in minutes.
Then the cost for this 1-minute call is ...
5 + 1·1 = 6 . . . . dollars
Each plan will charge $6 for a 1-minute call.
Answer:
Step-by-step explanation:
Let x represent the call duration that would cost the same amount with either plans.
On her plan, christina pays $5 just to place a call and $1 for each minute. This means that the total cost of x minutes on this plan is
x + 5
When brenna makes an international call, she pays $1 to place the call and $5 for each minute. This means that the total cost of x minutes on this plan is
5x + 1
For both costs to be the same, the number of minutes would be
x + 5 = 5x + 1
5x - x = 5 - 1
4x = 4
x = 4/4 = 1
A call duration of 1 minute would cost exactly the same under both plans. The cost of the call would be
5 × 1 + 1 = $6
