posted by Greg .
how would you work out
the minus is for the whole fraction
please show your working
thanks in advance :)
What do you mean by "work out" ?
Are you graphing the function ?
Make a table of values and graph some of the points. You should see what happens to the graph.
Try to get a "feel" for the numbers.
e.g. as you pick larger x's, doesn't the value of 2/x become smaller and smaller?
similarly if you pick fractional values of x, doesn't 2/x become larger and larger. What happens if you pick x = 0 ? OH oh!
Now try an x close to zero, say x = .01
Can you see the pattern?
Now repeat, using negative values of x.
Now change your equation to y = 5/x or something like that.
Can you generalize what y = n/x would look like?