math x=7y-42x-3y=14
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math x=7y-42x-3y=14
Seems to have become a little jumbled.
Would you please clarify your question.
I think that's supposed to be two different equations, yes?
x=7y-42 and
x-3y=14
If so, the first equation tells you exactly what x is equal to. You can just substitute that expression in place of the x in the second equation. In other words, wherever you see an x in the second equation, write (7y-42) instead.
That will give you an equation with only one variable, y, which you should be able to easily solve for. Then you just have to plug that y value back into the first equation to get the value of x.
If you want to check your answers when you're all done, plug the values you got for x and y into both equations, and make sure they work out to be true. (For the second equation, for example, after you plug in x and y, you should end up with 14 = 14).
I am a newbie, and I first apologize if mimeTex is not good.
If it reads, then see jcaron2's answer.
If it reads, you have 2 (equivalent) choices:
1. Substitutein place of
, thus you have
2.is the same as
, then the difference between these equations gives you
In both cases you have a one variable equation. There is no need to check solutions if you do things correctly, and linear equations never gets problems (as sign choices, singularities, etc.).
I bet your interpretation is correct (the one where the gap is between the 4 and the 2x, not the 42 and the x).
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