Created by rory.examtime
almost 6 years ago


A linear equation is an algebraic equation with two variables (x & y) which refers to a line in the coordinate plane.
There are two common forms of linear equations:
1. y = mx + c
 m and c are constants m is equal to the slope of the line.
2. ax + by + c = 0
 a, b and c are constants
If we know the equation of a line, we can plot it on the coordinate plane.
This is done by subbing a value for x (usually 0) to find a corresponding yvalue, and vice versa.
x represents the horizontal coordinate
y represents the vertical coordinate
E.g :y = 4x + 7
Let x = 0
y = 7
=> (0, 7) is on the line
Then, let y = 0
0 = 4x + 7
4x = 7
x = 4/7
=> (4/7, 0) is also on the line.
Now that we have two points on the line, we can plot it by drawing a straight line which passes through both.
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