Hak cipta © 2009
MatematikaRia.com


Equation of a Straight Line
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?



y = how far up
x = how far along
m = Slope or Gradient (how steep the line is)
b = the Y Intercept (where the line crosses the Y axis)

Knowing this we can work out the equation of a straight line:
Example 1
b = 1
Example 2
b = 0
This gives us y = –3x + 0
We do not need the zero!
Play With It
You can see the effect of different values of m (the slope) and b (the y intercept) at Explore the Straight Line Graph
Country
Note:
Different Countries teach different "notation":
In the US the notation is: 
y = mx + b 
In the UK, Australia, Ireland, India, Jamaica, Pakistan, Brunei, Malaysia and Malta: 
y = mx + c 
In Denmark and Holland: 
y = ax + b 
In Finland and Ukraine: 
y = kx + b 
In Sweden: 
y = kx + m 


In your country: 
let us know! 
... but it all means the same thing, just different letters.


