# Using the point slope form to write an equation

Convert to slope-intercept form to solve for a particular value of x or y. Using the Point-Slope Form of a Line Another way to express the equation of a straight line Point-slope refers to a method for graphing a linear equation on an x-y axis.

You could have used any triangle to figure out the slope and you would still get the same answer. So that change in x is going to be that ending point minus our starting point-- minus a. So this is slope-intercept form. You can use either point to find the equation.

And we know this is the slope between these two points. You will find, in this example, the equation will be the same as in the previous problem. Slope is equal to change in y over change in x. You do not have to understand EZ Math Movie to use this application.

Finally, solve for y by adding 1 to both sides to get our answer of: And the exact same logic-- we start at x equals a. The variable m is the slope of the line. Next compute the slope See Slope-Intercept Form Now, pull it together using the point-slope equation.

The 'b' value referred as y-intercept is where the line crosses the y-axis. That's the slope between any two points on this line. In order to use the slope-intercept form, one needs a slope and the y-intercept.

Our change in y-- well let's see. So very quickly, you could use this information and your knowledge of point-slope form to write this in this form.

So this right over here is slope-intercept form. Example 2 Find the equation in point-slope form for the line shown in this graph: The Point slope method uses the X and Y co-ordinates and the slope value to find the equation. The name of this known point is x1, y1and these x- and y-coordinate values are the numbers that appear, respectively, as x1 and y1 in the equation.

So if we multiply both sides by x minus a-- so x minus a on the left-hand side and x minus a on the right.

To use the point-slope form, we need a point on the line and the slope. Point slop is one of the method used to find the straight line equation. That means that the first thing we must do is find slope. If that's not what you got, re-read the lesson and try again.

So, any point on the line will yield the same equation. Point-slope form is all about having a single point and a direction slope and converting that between an algebraic equation and a graph. The name comes from the wit one can graph a line given only the slope and one point Definition for the point-slope form of a linear equation with two unknowns.

Examples 1 - 3 will explain how to use this equation. Well, our change in y-- remember slope is just change in y over change in x. Putting it all together, our point is -1,0 and our slope is 2. Your slope was given to you, so where you see m, use 2. It is useful because if you know one point on a certain line and the slope of that certain line, then you can define the line with this type of formula and, thus, find all the other points on that certain line.

And this right up here is point-slope form.Using the point-slope form together with the slope formula will allow us to write such an equation. Now because the slope of the desired line must also be we can use the point-slope form to write the required equation: This simpliﬁes to and we have our equation in slope-intercept form.

y 3 4 x 6 y (3) 3 4 [x (4)] 3 4, y 3 4 x 3. You can find the straight-line equation using the point-slope form if they just give you a couple points: Find the equation of the line that passes through the points (–2, 4) and (1, 2).

I've already answered this one, but let's look at the process. Writing Equations Using Point-Slope Form Worksheet Point-Slope Form 1. Write an equation in point-slope form of the line that passes through the point (1, 2) and has a slope of 4. I.

Model Problems The “point-slope” form of a line with slope m that passes through the point (x1, y 1) is given by the formula y – y 1 = m(x – x 1).

When you are given the slope of a line and a point, or two points on a line, it is easier to find the equation of the line in point-slope form than.

to write the equation of a line using the point-slope form of a line. 2. to understand and be able to explain the different part of the point-slope equation.

3. to be able to differentiate between when to use the different forms of a line. Equation of a straight line can be calculated using various methods such as slope intercept form, point slope form and two point slope form method.

Point slope method is one such method used to find the straight line equation when one co-ordinate and slope is given.

Using the point slope form to write an equation
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