Help anyone? Q: Rewrite the equation y=2x-4 as a function of x?

Answer 1

if i understand your question corectly your problem is already solved

f(x) = 2x - 4.

see... nothing to it. y is fhe function of x.

Answer 2

The equation is already a function of x:
      f(x) = 2x - 4

If you want to solve for x however, do the following:

The original equation:
      y = 2x - 4
Flip it around:
      2x - 4 = y
Add 4 to both sides:
      2x = y + 4
Divide both sides by 2:
      x = ( y + 4 ) / 2

So as a function of y, it would be:
      f(y) = ( y + 4 ) / 2

Answer 3

Need to get x by its self on one side of the equation.

1. add 4 to both sides y+4 = 2x-4+4
y+4 = 2x

2. divide both sides by 2 (y+4) /2 = 2x / 2
(y+4) /2 = x

or y/2 + 2 = x

Answer 4

y(x)=2*x-4 is written already as a function of x. Writing x as a function of y, add 4 to both sides and then divide both sides by 2 to get x(y)=(y+4)/2.

Answer 5

$ mathomatic
Mathomatic version 12.5.10 (www.mathomatic.org)
Copyright (C) 1987-2006 George Gesslein II.
50 equation spaces available, 960000 bytes per equation space.

1-> y=2x-4

#1: y = (2*x) - 4

1-> x

#1: x = y/2 + 2

Answer 6

x=2y-4

x+4=2y

y=x=2

Answer 7

y is already a function of x
f(x)=2x-4

Answer 8

sure, basically all you want is x =

So go through undoing your order of operations to get x by itself.

Hint, your first step is to add 4 to both sides. After that, there is only one more step!

Answer 9

f(x) = 2x - 4. That's all !!