The Student Room Group
Reply 1
Rearrange the second equation so that you have an 'x=...' or a 'y=...'

Then put that into the first equation.
Reply 2
You can use the first suggestion or you can make X the subject for both then make the 2 equations equal.
Reply 3
Using second equation,x=12/y


Now put this into the first equation and you'll have a solution for y.

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