a. Ryan's rate of change is $15 per month;
Taylor's rate of change is $20 per month
b. Ryan's starting balance is $50;
Taylor's starting balance is $25.
Recall:
- A linear function is modelled by the equation, y = mx + b, where m is the rate of change and b is the initial value (starting value).
- Rate of change = change in y/change in x
Ryan's Savings Plan Function:
s = 15m + 50
Thus, the starting value (starting balance) modelled by this function is $50
The slope/rate of change is $15 per month
Taylor's Savings Plan:
Given the table, the starting value will be the amount saved (initial value) at 0 number of months.
- Therefore, Taylor's starting balance is: $25
Using (0, 25) and (1, 45) find the rate of change:
- Rate of change = (45 - 25)/(1-0) = 20/1 = $20
In summary:
a. Ryan's rate of change is $15 per month;
Taylor's rate of change is $20 per month
b. Ryan's starting balance is $50;
Taylor's starting balance is $25.
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