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dellasaurusrex
Let g(x) be the reflection of f(x) = 3x + 2 in the x-axis. What is a function rule for g(x)? g(x) = 3x – 2 g(x) = –3x – 2 g(x) = 3x + 2 g(x) = –3x + 2
To visualise it, draw the line y=3x+2 You know for example that if x=2 y= 8 so the reflections gonna go through the same point but on the other side of the axis
http://www.wolframalpha.com/input/?i=y%3D3x+%2B+2%2C+y%3D-3x%2B2
so... g(x) = –3x – 2?
No, the y value will stay the same on the oppsite side, so it's g(x)= -3x+2
Think of the dot (2,8) if you want it's reclection the point on the other side is (-2,8) try to draw it and you'll get the idea
|dw:1349180529022:dw| The vertical reflection of f(x) is -f(x)