[SOLVED] solving system

which one should i use for doing a substitution method?

6y=x+18
or
2y-x=6

Quote:

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Originally Posted by Scoobylover

which one should i use for doing a substitution method?

6y=x=18
or
2y-x=6

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You have,

6y-x=18
Thus, x=6y-18

Substitute that into equation (2),
2y-(6y-18)=6
2y-6y+18=6
-4y=-12
y=3
Now you can find "x"