Question 58368
x-2y=4 
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You have not said what the instructions are for
this equation.  It has an infinite number of 
"solutions".
Usually you are asked to put the equation in slope-
intercept form which is y=(1/2)x-2
Now if you let x=0 you get y=(1/2)(0)-2, so y=-2
But you can substitute any number for "x" and 
then solve for "y".
Don't know if this helps you.
Cheers,
Stan H.