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Reflections of graphs along various lines.

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Presentation on theme: "Reflections of graphs along various lines."— Presentation transcript:

1 Reflections of graphs along various lines.
Precalculus Section 4.3 Reflect graphs and use symmetry to sketch graphs Reflections of graphs along various lines. The graph of y = -f(x) is the graph of y = f(x) reflected in the x-axis.

2 The graph of y = |f(x)| is identical to the graph of y = f(x) when f(x) > 0 and identical to the graph of y = -f(x) when f(x)<0.

3 The graph of y = f(-x) is the graph of y = f(x) reflected in the y-axis.

4 The graph of x = f(y) is the graph of y = f(x) reflected in the line y=x.

5 Graph the following functions.

6 Tests for symmetry in various axes
Symmetry in the y-axis: (-x,y) is on the graph whenever (x,y) is Symmetry in the x-axis: (x,-y) is on the graph whenever (x,y) is.

7 Test for symmetry in the origin:
(-x,-y) is on the graph whenever (x,y) is. Test for symmetry in the line y = x: (y,x) is on the graph whenever (x,y) is.

8 Test for symmetry in the: x-axis y-axis line y=x origin
x3 + y3 = 1

9 assign Page 136 Problems 1-8, 16


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