The equation of a linear function is:

y = mx + b

Its graph is an oblique straight line, which is defined by two points of the function.

y = x + 4

 x y = x + 4 0 −4 4 0 m is the slope of the straight line.

The slope is the inclination of the line with respect to the x-axis.

If m > 0, the function is increasing and the angle of the line with the positive x-axis is acute. If m < 0, the function is decreasing and the angle between the line with the positive x-axis is obtuse. Two parallel lines have the same slope. n is the y-intercept and indicates the intersecting point of the line with the vertical axis. If b = 0, the equation of a linear function is:

y = mx

Its graph is a straight line passing through the origin.

y = 2x

 x y = 2x 0 1 2 3 4 0 2 4 6 8 ### Identity Function

y = x

Its graph is the bisector of the first and third quadrant. 1 y = 2x - 1

x y = 2x-1
0 -1
1 1 2y = -¾x - 1

x y = -¾x-1
0 -1
4 -4 Need a Maths teacher?

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Emma

I am passionate about travelling and currently live and work in Paris. I like to spend my time reading, gardening, running, learning languages and exploring new places.