This list should help you to revise. Look through it carefully and decide how confident you are on each point (2 = Fine, 1 = Some work needed, 0 = No idea). Then concentrate on what you need to.

• Represent a relation in different ways and convert between each, including:
• Ordered pairs
• Mapping diagram
• Graph
• Algebraic equation
• Data table
• State the domain and range of a relation.
• Decide if a relation is a function or not.
• Evaluate f(k) where f and k are given. E.g. If f(x) = 3x – 1, what is f(3)?
• Solve f(x) = k where f and k are given. E.g. If f(x) = 3x – 1, solve f(x) = 5?
• Rearrange f(x) to give f-1(x). If f(x) = 3x – 1, what is f-1(x)?
• Evaluate f-1(k) where f and k are given. E.g. If f(x) = 3x – 1, what is f-1(3)?
• Solve f-1(x) = k where f and k are given. E.g. If f(x) = 3x – 1, solve f-1(x) = 5?
• Graph a piecewise function from an equation.
• Write the equation of a piecewise function from the graph.
• State the domain and range of a piecewise function.
• Draw a line of best fit on a scatter plot and find its equation.
• Input a data table into the TI-84 and use it to find the line of best fit.
• Explain the meaning of the slope of a linear relation.
• Discuss whether a relation might or might not be linear.
• Discuss whether a relation might or might not be a function.
• Interpret graphical information, including domain and range, in the context of a given problem.
• ALL GRADE 9 MATERIAL ON LINEAR EQUATIONS AND GRAPHS.