ok..how do i make x the subject of the formula when fractions are involved :S..... equation posted in replies..

Question

honeymonster · Answer

$$\frac{ 1 }{ x } + \frac{ 1 }{ y } = 1$$

hartnn · Answer

since 1/y is added,first u can subtract 1/y from both sides..what will u get?

honeymonster · Answer

1/x =y

hartnn · Answer

nopes,u should subtract 1/y to 1,like this
$$\frac{1}{x}=1-\frac{1}{y}$$
got this?

honeymonster · Answer

oh ok...so would you then multiply?

hartnn · Answer

multiply what?

honeymonster · Answer

the fractions to cancel them out? :S or am i going completely the wrong direction?

hartnn · Answer

ok,i will show u next step,see if u can understand:
$$\frac{1}{x}=\frac{y-1}{y}$$

got this?

honeymonster · Answer

ok i understand that bit..

hartnn · Answer

now since there is 1/x which is reciprocal of x,
i would just invert both sides like this:
$$x=\frac{y}{y-1}$$
got this?

honeymonster · Answer

ok..i think i get that..so basically you would just swap the top and the bottom numbers on the right side?

hartnn · Answer

yes,because there was 1/x on left side
and u did the same thing on both sides.

honeymonster · Answer

ok thank you :)

hartnn · Answer

welcome :)