Equations of Straight Line Graphs

Graphs parallel to the y -axis All graphs of the form x = c, where c is any number, will be parallel to the y -axis and will cut the x -axis at the point ( c, 0). x = –3 x = –10 x = 4 x = 9 O

Graphs parallel to the x -axis All graphs of the form y = c, where c is any number, will be parallel to the x -axis and will cut the y -axis at the point (0, c ). y = –2 y = 5 y = –5 y = 3 O

Drawing graphs of functions To draw a graph of y = x – 2: 1) Complete a table of values: 2) Plot the points on a coordinate grid. 3) Draw a line through the points. 4) Label the line. 5) Check that other points on the line fit the rule. x y = x – 2 –3–2–10123 y = x – 2 –5–4–3–2–101 O

Practise plotting functions using this tool