Save guides, add subjects and pick up where you left off with your BBC account. The equation of a straight line can also be written in the form \(f(x) = mx + c\). This is called function notation ...

The straight line through two points will have an equation in the form \(y = mx + c\). We can find the value of \(m\), the gradient of the line, by forming a right-angled triangle using the ...