Better Students Ask More Questions.
If y-3=7 and x+3y=6 then x=?Show your work.
3 Answers | add yours
High School Teacher
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.
Posted by jlcannad on May 28, 2009 at 5:10 AM (Answer #1)
x+3y=6 and y-3=7
Posted by emplay on May 28, 2009 at 5:13 AM (Answer #2)
Join to answer this question
Join a community of thousands of dedicated teachers and students.