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4 votes
Please you can help me. Thanks

Please you can help me. Thanks-example-1

1 Answer

3 votes

Answer:

y =
15(4)^(x) or y =
15(-4)^(x)

Explanation:

Standard equation is: y=
ab^(x) ................(1)

The function passes through (0,15) and (2,240).

so, by putting x = 0 and y = 15, we get

15 =
ab^(0)

a = 15

Also, putting x= 2 and y= 240, we get

240 =
ab^(2)

240 =
15b^(2)


b^(2) =
(240)/(15)


b^(2) = 14

b = 4 or b= -4

Putting the values of a and b in (1), we get

y =
15(4)^(x) or y =
15(-4)^(x)

User Chimeric
by
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