## How do you find the equation of a line given two points?

**Equation from 2 points using Slope Intercept Form**

- Calculate the slope from 2 points.
- Substitute either point into the equation. You can use either (3,7) or (5,11)
- Solve for b, which is the y-intercept of the line.
- Substitute b, -1, into the equation from step 2.

## How do you find the equation of a line from a graph?

A15.7 Find the equation of a line on a graph –

## How do you find the equation of a line in GCSE?

y=mx+c, the trick to easily finding the equation of a line – GCSE

## What is the formula for straight line?

The general equation of a straight line is y = mx + c, where m is the gradient, and y = c is the value where the line cuts the y-axis. This number c is called the intercept on the y-axis. The equation of a straight line with gradient m and intercept c on the y-axis is y = mx + c.

## What is perpendicular line?

In elementary geometry, the property of being perpendicular (perpendicularity) is the relationship between two lines which meet at a right angle (90 degrees). A line is said to be perpendicular to another line if the two lines intersect at a right angle.

## What are the different equations of a line?

**The equations of lines are of the following forms:**

- 1 – Slope intercept form. y = m x + b.
- 2 – Point Slope Form. y – y 1 = m (x – x 1).
- 3 – Equation of a Vertical Line. x = k , where k is a constant.
- 4 – Equation of a Horizontal Line. y = k , where k is a constant.
- 5 – General Equation of a Line.

## How do you find perpendicular lines?

First, put the equation of the line given into slope-intercept form by solving for y. You get y = 2x +5, so the slope is –2. Perpendicular lines have opposite-reciprocal slopes, so the slope of the line we want to find is 1/2. Plugging in the point given into the equation y = 1/2x + b and solving for b, we get b = 6.

## How do you find the slope of a line?

The slope of a line characterizes the direction of a line. To find the slope, you divide the difference of the y-coordinates of 2 points on a line by the difference of the x-coordinates of those same 2 points .