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y = mx + c
The Equation of a straight line, stating that the value of y equals the gradient x the given x coordinate + the y intercept.
Gradient
The rate of change of y in terms of x.
Y intercept
The point at which a curve passes through the y axis (the y value when x = 0).
ax + by + c = 0
An alternate equation for straight lines, where a,b and c have to be integers.
Integers
Whole numbers.
y - y1 = m(x - x1)
A way of writing the equation of a straight line when a set of coordinates is known.
Paralell Lines
Lines with the same gradient that do not cross at any point (equal gradient and different y intercept).
Perpendicular Lines
Lines with negative reciprocal gradients (m and -1/m).
Distance between Points
This can be found using pythagoras’ theorem and modelling x and y as the 2 shorter sides of a right angled triangle.
