Which method for this DE?

[AndyW]

I'm new to DEs, and can do most I've come across so far, but this has me stumped:

\frac{dy}{dx}=\frac{4x-2y+4}{2x+y-2}

Out of these methods which should I use?

1 Integrating Factor
2 Seperable
3 Bernoulli
4 Change of Variable (y=xv)

I'm pretty sure it's the 4th but I've not been able to find a solution. Could someone confirm that this is the correct approach?

[arildno]

Basically, yes, however:
You'll remain stumped as long as you do not "eliminate" the constants in your expression (that would be +4 in the numerator, -2 in the denominator).

In order to eliminate these constants in an acceptable manner, use the following trick:
Find the solutions x_{0},y_{0} of the linear system:

4x-2y+4=0
2x+y-2=0

This yields: x_{0}=0,y_{0}=2
Now change the scales:
\hat{x}=x-x_{0}, \hat{y}(\hat{x})=y(x)-y_{0}

In the hatted variables, you now have the differential equation:
\frac{d\hat{y}}{d\hat{x}}=\frac{4\hat{x}-2\hat{y}}{2\hat{x}+\hat{y}}

This should help you solve the problem..