# How to write an exponential function from two points

## Find exponential function from two points worksheet

Let's try one, 'cause one is a nice, simple number. It is a non-linear system, but it's a pretty simple one. Well, you see that right over here. Every time you increase your x by one. Divide both sides by nine. And here on the x axis, we're marking off every half. And they tell us that f of one is one, is equal to one. And just to be clear, when x is one, y is one.

We start at nine, and we end up at one. Inthe world population was 1. So we could write f of one, which would be negative four times one plus b. If neither point has a zero x-value, the process for solving for x and y is a tad more complicated.

### Find exponential function from two points calculator

I gotta be careful here, I got a little bit. And given the fact that this exponential function keeps decreasing as x gets larger and larger and larger is a pretty good hint that our r right over here, they tell us that r is greater than zero, but it's a pretty good hint that r is going to be between zero and one. So every time you increase your x by one, you are decreasing your y. We started at negative one. Divide both sides by nine. The rate and change of the vertical axis with respect to the horizontal axis. Now let's use this other point. And so now we can write that f of x is equal to negative four, negative four, that's our slope, times x. When x is negative one, y is nine. This other point, they tell us. They tell us that g of one, which would be the same thing as a times r to the first power or just a times r, that that is equal to one, or a times r is equal to one.

How To: Given two data points, write an exponential model. And just to be clear, when x is one, y is one.

Well, we start at nine. So here we could just use the two points to figure out these two unknowns.

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