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 \(y = ...
Coordinates are given in the form (\(x\), \(y\)). The first number is the position in the \(x\)-direction (horizontal) and the second is the position in the \(y\)-direction (vertical).