Question 395915: Dont know what this is and how to do it at all. Teacher does not explain at all.
y=2x-9
x+3y=8
Solve each system by substitution Found 2 solutions by richard1234, stanbon:Answer by richard1234(7193) (Show Source):
You can put this solution on YOUR website! Substitute the expression for y from the first equation into the second equation to obtain a single-variable equation. As in,
x + 3(2x - 9) = 8
Then, you can easily solve for x, then plug in x into either equation to find y.
You can put this solution on YOUR website! y=2x-9
x+3y=8
Solve each system by substitution
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Substitute for "y" in the 2nd equation.
Then solve for "x":
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x + 3(2x-9) = 8
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x + 6x-27 = 8
7x = 8+27
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7x = 35
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x = 5
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Now solve for "y"
y = 2x-9
y = 2(5)-9
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y = 1
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Solution: (5,1)
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Cheers,
Stan H.
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