Algebraic expressions can be simplified by multiplying out the brackets and collecting like terms, or by factorising with a common factor. Straight line gradients can be calculated using a formula.

In this tutorial you are given the definition of the gradient and I run through examples of finding various gradients of straight lines when given the coordinates of points.

In this video you are shown the relationship that exists between the gradients of parallel lines.

In this video you are shown the relationship that exists between the gradients of perpendicular lines.