That's a bad example- you have three equations to determine the two variables x and y. Also, in order to talk about "free variables" all of your equations should just have "x= " or "y= ", etc., not "5x= ". Writing that last equation as x= w/5, we could have x= -2z+ z= -z, y= z and then, once x has been determined, w= 5x= -5z. The only "free variable" is z.and heres an example i made up
what are the free variables? z and w?? why?
No. Write x= and y= with as few variables as possible on the right side, cancelling all you can. Then the variables left on the right are "free variables".would this be a good stragety to follow
say u have x=y+z
y=z like in the first example....
cross out all the variables which have an x and a y, since they are definined.. and the reamining none crossed out terms are the free variables ?
thanks guys and gals