Question

Choose the best descriptor for the grpah of f(x)=e^-x+5.

A. It increases and goes through the point (0, 6).

B. It decreases and goes through the point (0, 6).

C. It increases and goes through the point (5, 1).

D. It decreases and goes through the point (5, 1).

Answer 1

The answers have two points: (0,6) and (5,1). Which one satisfies f(x)=e^-x+5 ?

Answer 2

would it be C?

Answer 3

No. If you look at the 4 answer choices they use two points: (0,6) and (5,1).
Which one of the two points satisfies f(x)=e^-x+5 ?

Answer 4

would it be D because it decreases?

Answer 5

ali: Please answer the question I asked you.

Answer 6

I thought I did, I was thinking that the point 5,1 would satisfy the function and because it is a negative i thought it would decrease?

Answer 7

Does point (5,1) satisfy y = e^-x+5 ?
If I put x = 5 in the equation do we get y = 1?

Answer 8

oh, no it doesnt give you 1

Answer 9

How about (0, 6) ?

Answer 10

yes!6=6 which is 1 right?

Answer 11

(0,6) satisfies the equation. (0,6) is a point on the curve.
So the answer has to be either a or b.

e^-x decreases as x increases. It is called an exponential decay function.

So which choice says: it goes through (0,6) and decreases?

Answer 12

B?

Answer 13

yes.

Answer 14

thank you!!

Answer 15

yw.