SOLUTION: using substitution or elimination, find x and y 3x+y=1 y=x+9

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Question 224262: using substitution or elimination, find x and y
3x+y=1
y=x+9
Answer by drj(1380) About Me  (Show Source):
You can put this solution on YOUR website!
Using substitution or elimination, find x and y

3x+y=1
y=x+9 or -x+y=9

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION
Solve:
+system%28+%0D%0A++++3%5Cx+%2B+1%5Cy+=+1%2C%0D%0A++++-1%5Cx+%2B+1%5Cy+=+9+%29%0D%0A++We'll use substitution. After moving 1*y to the right, we get:
3%2Ax+=+1+-+1%2Ay, or x+=+1%2F3+-+1%2Ay%2F3. Substitute that
into another equation:
-1%2A%281%2F3+-+1%2Ay%2F3%29+%2B+1%5Cy+=+9 and simplify: So, we know that y=7. Since x+=+1%2F3+-+1%2Ay%2F3, x=-2.

Answer: system%28+x=-2%2C+y=7+%29.



I hope the above steps and explanation were helpful.

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And good luck in your studies!

Respectfully,
Dr J