1. Warm-up: Find solution to these sample SAT questions. 1)What is one possible value of x if 1 < < 2 2)If pq = 6, qr = 2, and pr = 3, then pqr = ?

2. Lesson 3-3: Functions Objective Students will recognize functions & their graphs Students will use function notation to find function values.

3. Function A relation where every x value is matched to one and only one y value. Means: Ordered Pairs (Table) → x values cannot repeat Graph → Points may not be vertical to each other Example 1 Functions? (3, -9), (-2, 8), (-3, -9) (5, 8), (-2, 3), (3, 10), (-2, -6) YES NO

4. Function Notation Replaces “y” with “f(x)” → read as “f of x” y = 2x – 3 → f(x) = 2x – 3 The quantity in parenthesis is the variable. So…writing f(6) means replace the variable with 6 f(6) = 2(6) - 3 f(6) = 9 Example 2 Evaluate f(-2) for f(x) = -2x 2 – 1

5. Finding Domain (1 st degree) State what values are acceptable When are values not acceptable? If they make the denominator = 0, like… Domain = {x | x ≠ 2} OK to define domain by what it can’t be! Example3 Domain of Solve 5x + 8 = 0