# How to write a function equation from a graph

So we get f of x is equal to negative 4x plus five.

They tell us that g of negative one is going to be equal to nine. You are decreasing your y by four there, so that makes sense that the slope is negative four. We started at negative one.

### Graph of functions

So they give us two points. We can see that the input value for every point on the line is 2, but the output value varies. X equals one. So 9r, instead of writing an a here, I'll write 9r, times r is equal to one. A quadratic function's graph is a parabola The graph of a quadratic function is a parabola. Every time you increase your Well we want to write it as Y equals MX plus B. When x is negative one, y is nine. We'll use that as our 3rd known point. Modelling This is a good question because it goes to the heart of a lot of "real" math. You should learn all three methods because there will be times when one of the methods will not be obvious. So Y equals 2X plus 4 and that is how we find the equation of the line from the graph. We could just take this a and substitute it in right over here for a, and so we would get 9r for a. So we're at negative 1 and we can go up two, right, and over one. In the slope formula, the denominator will be zero, so the slope of a vertical line is undefined.

So we're at negative 1 and we can go up two, right, and over one. And so this part right over here, we could write that as negative four plus b is equal to one, and then we could add four to both sides of this equation, and then we get b is equal to five.

Standard Form Equations and Practice What if the equation is not in slope-intercept form?

This function is represented by Line II. Let's say that this point is negative 1, 2 and this point is 0, 4. It intercepts at 4.

### Linear function calculator

This is a standard form equation. Lines I and III have the same slant because they have the same slope. And they tell us that f of one is one, is equal to one. And so this part right over here, we could write that as negative four plus b is equal to one, and then we could add four to both sides of this equation, and then we get b is equal to five. That's what slope is. Every time you increase your Sometimes it is easy to spot the points where the curve passes through, but often we need to estimate the points. It is a non-linear system, but it's a pretty simple one.

I gotta be careful here, I got a little bit. A quadratic function's graph is a parabola The graph of a quadratic function is a parabola. That's where it intercepts the Y axis.

System of Equations method To find the unique quadratic function for our blue parabola, we need to use 3 points on the curve. In the slope formula, the numerator is 0, so the slope is 0.

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