Rewrite the equation y = –2x – 4 as a function of x.
Please rtell me this is right.....
y + 4 = -2x
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Rewrite the equation y = –2x – 4 as a function of x.
Please rtell me this is right.....
y + 4 = -2x
not completely. a function of x means we want x ONLY on one side of the equal sign.Quote:
Originally Posted by Patience
so
y = –2x – 4
=> -2x = y + 4 ..........you were right up to here
=> x = (y + 4)/-2 ......divide both sides by -2
=> x = (-1/2)y - 2
Writing this as a function of x would usually require something like:Quote:
Originally Posted by Patience
y=f(x),
where f:x in R -> -2x -4
or alternatively y(x)=-2x -4.
RonL
well that's true, but i just figure she made a typo or phrased the question incorrectly.Quote:
Originally Posted by CaptainBlack
afterall, what self-respecting math book would give a problem where the solution is just to add (x) on one side? seems trivial to me
Yes, but I can't let misuse of mathematical language go without comment.Quote:
Originally Posted by Jhevon
Seeing as you have already answered the question that was probably
intended it is of some importance to show that the question as asked
means something entirely different.
RonL
agreedQuote:
Originally Posted by CaptainBlack