Galvin and henry 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 galvin's money box and the number of months (x):

number of months
(x)

amount remaining (dollars)
(y)

1

80

2

75

3

70

4

65

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

function 2:
y = −7x + 80

which statement explains which function shows a greater rate of change?
function 2 shows a greater rate of change, because henry spends $7 each month and galvin spends $5 each month.
function 2 shows a greater rate of change, because henry spends $80 each month and galvin spends $15 each month.
function 1 shows a greater rate of change, because galvin spends $15 each month and henry spends $73 each month.
function 1 shows a greater rate of change, because galvin spends $5 each month and henry spends –$7 each month.