Iris L.

asked • 03/03/17

Which function represents g(x), a reflection of f(x) = (3)x across the y-axis?

 Which graph represents a reflection of f(x) = (10)x across the y-axis? i need help guys please help me !
 

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Mark M. answered • 03/03/17

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f(x) = 3x reflected over y- axis is f(x) = -3x
f(x) = 10x reflected over y- axis is f(x = -10x
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Mark M.

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To reflect across the y-axis, replace x by -x.
 
So, for f(x) = 3x, f(-x) = 3(-x), which simplifies to -3x. 
 
Mark M (Bayport, NY)
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03/03/17

Mark M.

Thank you for the elaboration.
Mark M (Carson, CA)
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03/03/17

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