9-3 Graphing y = ax + bx + c 2 1a. y = x - 1 for -3<x<3 2 x -3 -2 0 1 2 3 y B. Does it open up or down? C. Identify the axis of symmetry and its vertex.

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9-3 Graphing y = ax + bx + c 2 1a. y = x - 1 for -3<x<3 2 x y B. Does it open up or down? C. Identify the axis of symmetry and its vertex x y

2.Use the equation y = x² + 8x + 13 for x = -7, -6, -5, … 0, to answer questions and make a table of values. x y a. What is the vertex of the parabola? b. What is its axis of symmetry? c. Find the y-intercept. d. Graph it. e. What are the x-coordinates of the 2 points where y = 13?

x y x y

3a. Graph y =.5x - 2x. 2 To find the x value of the turning point, use this formula., where a is the _____________ and b is the _____________ So, a = and b = Now you can make a table selecting x values that will enable you to graph the parabola over its line or symmetry. b. Does the graph have an axis of symmetry? If so, what is it? c. Name the vertex. d. Identify the y-intercept.

x y x y