Question

Adam and Edwin spend a certain amount of money from their money box each month to buy plants.

The table shows the relationship between the amount of money (y) remaining in Adam's money box and the number of months (x):

Function 1:


Number of Months
(x) Amount Remaining (dollars)
(y)
1 90
2 83
3 76
4 69


The equation shows the relationship between the amount of money, y, remaining in Edwin's money box and the number of months, x:

Function 2:
y = –9x + 90

Which statement explains which function shows a greater rate of change?

Answer 1

$7 upper rated everything each mouthes

Explanation:

(x) Amount Remaining (dollars)

(y)

1 90

2 83

3 76

4 69

Answer 2

Function 2 show a greater rate of change

in the first month (month 1)

y = -9 (1) + 90
y = 81
And from 90 down to 81 is a greater rate of change than 90 down to 83

In the table where the money goes down by $7 each month:
That equation is y= -7x +90