What is the equation for a vertical line? Take the x- and y-coordinates of the point, and insert them into the equation of the line. To find slope, divide the difference in values by the difference in values. that is why its equation is x = 1.5. The second way is to use two points from one line and one point from a perpendicular line. Thank you, wikiHow! This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. ", "Thanks a lot, it is very helpful with very easy examples.". Using the equation, set x equal to zero and solve for y to find the y-intercept, or set y equal to zero and solve for x to find the x-intercept. This article has been viewed 810,340 times. That means the line you're looking for would be defined as x = b: the line is vertical, m is "undefined" (infinity), and b is the x-intercept. Then, plug the slope into the slope-intercept formula, or y = mx + b, where "m" is the slope and "x" and "y" are one set of coordinates on the line. ", "Everything helped! You can see the effect of different values of m (the slope) and b (the y intercept) at Explore the Straight Line Graph. Using \(y - b = m(x - a)\) with m = 3, a = 4 and b = 1. Next, we just need to find, which is the line's -intercept. All right-angled triangles have two vertices of 45 degrees and one of 90 degrees. Or we could choose another value for x, such as 7: Going from left-to-right, the cyclist has to Push on a Positive Slope: b = 0 Grace is currently a math instructor at the City College of San Francisco and was previously in the Math Department at Saint Louis University. The equation of a straight line is usually written this way: (or "y = mx + c" in the UK see "The article led you through each method clearly, step by step, with picture examples and simple explanations. For example, if your coordinates are (3, 8) and (7, 12), the formula would read: m = (12-8)/(7-3) = 4/4 = 1. The equation of a straight line is usually written this way: y = mx + b (or "y = mx + c" in the UK see below) What does it stand for? Our team of exam survivors will get you started and keep you going. This article really helped me remember the formulas again. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Interpreting a trend line. It made a lot of sense, and it clicked in my brain. Next, solve the formula to find the value of "b," which is the y-intercept. This gives us divided by, or. Look at the National 4 straight line section before continuing. This leaves you with 5 = b, or, For example, the equation for the line with points on (3, 8) and (7, 12) is. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow.

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