If the \(y\)-coordinates are the same, the equation of the line will be of the form \(y = …\). The equation of a straight line on a graph is made up of a \(y\) term, an \(x\) term and a number ...

If an equation can be rearranged into the form \(y = mx + c\), then its graph will be a straight line. In the above: \(x + y = 3\) can be rearranged as \(y = 3 - x\) (which can be re-written as ...