Stretching graphs Watch

Procrastinator10
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Okay so, this is a really dumb question. But I'm looking back on my old notes for stretching graphs, and I am very confused. How is the graph y=x+4 stretched in the y direction by scale factor 5 = y=5x+20? I'd just like someone to explain please, without pointing out how stupid I am
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Mr M
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(Original post by Procrastinator10)
Okay so, this is a really dumb question. But I'm looking back on my old notes for stretching graphs, and I am very confused. How is the graph y=x+4 stretched in the y direction by scale factor 5 = y=5x+20? I'd just like someone to explain please, without pointing out how stupid I am
The graph of y=kf(x) is a stretch of the graph y=f(x) in the y direction by scale factor k.

Let k = 5 and f(x)=x+4
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Procrastinator10
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(Original post by Mr M)
The graph of y=kf(x) is a stretch of the graph y=f(x) in the y direction by scale factor k.

Let k = 5 and f(x)=x+4
okay, I understand that. But if you're stretching the graph of y=3^x by scale factor 1/2 why is it y=3^2x and not y=3^1/2x. This is annoying me because I remember understanding it fine in the lesson
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Procrastinator10
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Okay, never mind. I understand it now I was having a bit of a blonde moment!
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