SOLUTION: x+y=9 and y=2x

Question 596080: x+y=9 and y=2x
Answer by math-vortex(648) (Show Source): You can put this solution on YOUR website!
Hi, there--
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We can use the the substitution method to solve this system.
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Since y is equal to 2x, we can substitute 2x for y in the first equation, and solve for x.

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Now substitute 3 for x into either equation and solve for y. I'll use the second one.

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According to our algebra the ordered pair (3,6) in the solution for this system.
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It's ALWAYS a good idea to check this solution in the original equations to make sure we did not make a mistake.
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CHECK:

Perfect!
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Bingo!
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That's it! Feel free to email if you have questions about this.
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Ms.Figgy
math.in.the.vortex@gmail.com
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