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Question 741771: For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?
−x + 2y = 9
4x + 5y = 9
Found 4 solutions by lynnlo, richwmiller, ikleyn, MathTherapy:
Answer by lynnlo(4176)   (Show Source):
Answer by richwmiller(17219)  (Show Source):
Answer by ikleyn(53419)  (Show Source):
You can put this solution on YOUR website! .
For the following system, if you isolated x in the first equation to use the Substitution Method,
what expression would you substitute into the second equation?
-x + 2y = 9
4x + 5y = 9
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I isolate 'x' in the first equation by moving 'x' to the right side (with changing its sign)
and moving '9' to the left side (with changing its sign)
2y - 9 = x.
Then precisely this expression I will substitute into the second equation, replacing 'x' there
with 2y-9.
Thus I answered your question.
Answer by MathTherapy(10585)  (Show Source):
You can put this solution on YOUR website!
For the following system, if you isolated x in the first equation to use the Substitution Method, what expression
would you substitute into the second equation?
−x + 2y = 9
4x + 5y = 9
− x + 2y = 9
+ x - 9 - 9 + x ----- Adding "x" to, and subtracting 9 from both sides
2y - 9 = x <=== 1st equation solved for "x"
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