MAth
posted by Victoria
Is 3x+8y=5 a function? I am thinking yes

Steve
the equation describes a function, yes.
if you want to write y as a function of x, then you have to rearrange things a bit:
y = (53x)/8 
Graham
Well, do you know what a function is?
A function is an equation where every input has only one output.
In notation, x is the input. So the question is really asking: "Can x equal anything in following equation which will result in multiple yvalues?"
The best way to figure this out is to isolate y:
3x + 8y = 5
3x  3x + 8y = 5  3x
8y = 5  3x
y = 5/8  3/8x
So, can we get multiple yvalues given any x? In this case, the answer is no, so
3x + 8y = 5 is a function.
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