1. ## Rewriting function equation

Rewrite the equation y = –2x – 4 as a function of x.

Please rtell me this is right.....

y + 4 = -2x

2. Originally Posted by Patience
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.

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

3. Originally Posted by Patience
Rewrite the equation y = –2x – 4 as a function of x.

Please rtell me this is right.....

y + 4 = -2x
Writing this as a function of x would usually require something like:

y=f(x),

where f:x in R -> -2x -4

or alternatively y(x)=-2x -4.

RonL

4. Originally Posted by CaptainBlack
Writing this as a function of x would usually require something like:

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.

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

5. Originally Posted by Jhevon
well that's true, but i just figure she made a typo or phrased the question incorrectly.

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.

intended it is of some importance to show that the question as asked
means something entirely different.

RonL

6. Originally Posted by CaptainBlack
Yes, but I can't let misuse of mathematical language go without comment.