# Write linear equations When in doubt, check your work. We went from 6 to 0.

## Graphing linear equations

But just so you know what these are, point slope form, let's say the point x1, y1 are, let's say that that is a point on the line. So this 0, we have that 0, that is that 0 right there. For example, if the point of intersection with the y-axis is 0,5 , the y-intercept would be 5. Now, we can literally just algebraically manipulate this guy right here to put it into our slope intercept form. That makes sense. So the left-hand side of the equation-- I scrunched it up a little bit, maybe more than I should have-- the left-hand side of this equation is what? If you do it to the left-hand side, you can do to the right-hand side-- or you have to do to the right-hand side-- and we are in standard form. So once again, we just have to algebraically manipulate it so that the x's and the y's are both on this side of the equation. So we're pretty much ready to use point slope form. These are the same equations, I just multiplied every term by 3. And now to get it in slope intercept form, we just have to add the 6 to both sides so we get rid of it on the left-hand side, so let's add 6 to both sides of this equation.

Well, we have our end point, which is 0, y ends up at the 0, and y was at 6. So that's point slope form. It could be a negative 3 and 6. She is a freelance reader for Author Solutions Film and has held many other positions in television and film production. Now, we can literally just algebraically manipulate this guy right here to put it into our slope intercept form.

### Writing equations from graphs worksheet

If we do that, what do we get? This is our point slope form. Divide these values to get your slope. They really don't have any interpretation directly on the graph. So if you give me one of them, we can manipulate it to get any of the other ones. So the first thing we want to do is figure out the slope. So let's put it in point slope form. Include the sign of the numbers you plug in. Slope intercept form is y is equal to mx plus b, where once again m is the slope, b is the y-intercept-- where does the line intersect the y-axis-- what value does y take on when x is 0?

So let's do slope intercept in orange. And then 4 times 3 is So if you give me one of them, we can manipulate it to get any of the other ones.

## Equation of a line

And then standard form is the form ax plus by is equal to c, where these are just two numbers, essentially. Linear equations are fundamental to algebra, and thus fundamental to all higher mathematics. And if you calculate this, take your 6 minus negative 3, that's the same thing as 6 plus 3, that is 9. The y-intercept will be positive if it intersects the y-axis above the x-axis or negative if it intersects below the x-axis. If we do that, what do we get? The slope can be found by selecting two points on the line, determining the vertical rise and the horizontal run between the points and dividing them. Updated April 24, By Jane McDonaugh A linear equation is almost like any other equation, with two expressions set equal to each other. For example, if the point of intersection with the y-axis is 0,5 , the y-intercept would be 5. And when someone puts this little subscript here, so if they just write an x, that means we're talking about a variable that can take on any value. Photo Credits. And just to make sure we know what we're doing, this negative 3 is that negative 3, right there. Our y went down by 6. Well, our x-coordinate, so x minus our x-coordinate is negative 3, x minus negative 3, and we're done. That makes sense.

But just so you know what these are, point slope form, let's say the point x1, y1 are, let's say that that is a point on the line. If someone writes x with a subscript 1 and a y with a subscript 1, that's like saying a particular value x and a particular value of y, or a particular coordinate.

### Linear equation formula

Divide these values to get your slope. They really don't have any interpretation directly on the graph. Find the slope by finding any two points on a line. And then we have this 6, which was our starting y point, that is that 6 right there. If we want it to look, make it look extra clean and have no fractions here, we could multiply both sides of this equation by 3. Determine the value of m, which is the slope rise over run. So once again, we just have to algebraically manipulate it so that the x's and the y's are both on this side of the equation. So this 0, we have that 0, that is that 0 right there. So I'll start it here. The standard form of the linear equation can be derived from the graph or from given values. Now the last thing we need to do is get it into the standard form. I'm just saying, if we go from that point to that point, our y went down by 6, right? So let's do slope intercept in orange. So what can we do here to simplify this?

Let's do that. Subtract the x value of the first point from the x value of the second point.

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