# Maths unit A:Equations of lines, length of line segments and midpoints

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• Created by: rvsn
• Created on: 17-11-14 19:59
What is the equation for a straight line?
y=mx+c
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What does m stand for in the equation?
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What does c stand for in the equation?
The Y-intercept
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How do you work out the gradient?
Change in y/change in x
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How do you find the equation of a line?
1. Work out the gradient 2.Substitute the gradient into the equation 3.Substitute y and x depending on a point in the line that you know 4.Rearrange the equation to find c(the y-intercept) 5. Write out the equation with numbers for m and c
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How do you find the midpoint for line segments?
add the x coordinates together of the two end points of the line/2 and add the y coordinates together of the two end points of the line/2. This gives you the x and y coordinates for the midpoint
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How do you find the length of line segments?
Find the change in x at the two end points of the line and the change in y at the two end points of the line. Then just use pythagoras theorem to find the line length.
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## Other cards in this set

### Card 2

#### Front

What does m stand for in the equation?

### Card 3

#### Front

What does c stand for in the equation?

### Card 4

#### Front

How do you work out the gradient?

### Card 5

#### Front

How do you find the equation of a line?