First of all you must realise that y=X+1 is an equation that describes a stright line. Now choose a value for X (any value, but better choose a small value: e.g: 1, 2, 3, 4....) and calculate the Y value for that X. Repeat it. Now you have 2 points (x1:y1) and (X2:Y2) (e.g: [0;1] and [1;2 ...