Question 175937: Solve each system by the addition method.
3x-2.5y=7.125
2.5x-3y=7.3125
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Solve each system by the addition method.
3x-2.5y=7.125
2.5x-3y=7.3125
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Multiply 1st by 2.5 and 2nd by -3 to get:
7.5x - 6.25y = 2.5*7.125
-7.5x +9y = -3*7.3125
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Add to get:
2.75y = -4.125
y = -1.5
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Substitute to solve for "y":
3(-1.5) -2.5y = 7.125
-4.5 -2.5y = 7.125
-2.5y = 11.625
y = -4.65
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Cheers,
Stan H.
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Cheers,
Stan H.
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