If y-3=7 and x+3y=6 then x=? Show your work.

Expert Answers

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I can't answer x+3y=6 right now.  I have two variables (x and Y) so I'm stuck.

So, I turn to my other equation.  y-3=7.  If I add three to each side of the equation, I get y=10.

Now that I know y=10, I can put the number 10 in every place there was a "y."  So, the second equation looks like this...



x+30=6      So I subtract 30 from each side.



I then check myself by putting all my numbers back into the original equations.

10-3=7 and -24+3(10)=6

Yep, that works.


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