Explain how to evaluate an algebraic expression for given values of the variables. How would a person evaluate the expression "3x - 4y + 9" when x = 2 and y = 5?
(i) Explain the difference between a variable, a variable expression, and an equation.
(ii) Explain the difference between a constant and a variable.
(iii) Explain the difference between a constant and a coefficient.
(iv) Explain the difference between a term and a factor. Use examples to support the explanations.