Question 215613: 3x+4y=-8 and -5x+y=-25
Found 2 solutions by stanbon, RAY100:
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 3x+4y=-8
-5x+y=-25
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Multiply thru the 2nd equation by 4 to prepare for elimination:
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3x+4y = -8
-20x+4y = -100
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Subtract the 2nd from the 1st and solve for "x":
23x = 92
x = 4
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Substitute into 3x+4y=-8 to solve for "y":
3*4 + 4y = -8
3 + y = -2
y = -5
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Cheers,
Stan H.
Answer by RAY100(1637) (Show Source):
You can put this solution on YOUR website! (1) 3x+4y = -8
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(2) -5x +y = -25,,,,,or y= 25+5x,,,,,
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subst in (1),,,,3x +4(25+5x) = -8
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3x +100+20x = -8
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23x = -108
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x= -4.7,,,,,,,y=25+5(-4.7) = 1.5
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check,,,(1) 3(-4.7) +4(1.5) = -8
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-14.1 +6 = -8,,,,,ok
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(2) -5(-4.7) + 1.5 = -25,,,ok
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