A straight line is the shortest distance between
The Gradient of a line is a measure of its slope relative to the x axis.
A positive gradient goes upwards, from left to right.
A negative gradient goes downwards, from left to right.
The gradient is found by dividing the vertical distance by
the horizontal distance.
To draw a line from its equation
This gives the points
(0,0) , (1,2) , (2,4), (3,6) and (4,8)
Plotting these points and joining with a straight lines gives
Extrapolating the table backwards
The line y = x has values
y = mx + c
Where m= gradient and c = y-intercept,
the value of y when x is zero.
Plotting the graph of a line from its equation.
Finding the equation of a line from its graph.