The total utility from a bundle (6,1) is 6. Hence, you fix u at 6 and you let vary either x1 or x2 the other being the dependent variable.
The indifference curve is then x2 = 6/x1.
Ok so I have a utility function of
U = x1x2
It asks how do I write an equation for the indifference curve for (6,1)
I have spent 2 hours on this, I know its easy, I honestly cannot remeber anything about equations of lines or the sort. I am thinking that if u=6. Then prehaps it would just be
I really don't know. there is no examples on how to do this I think it assumes I know how to equate curves.