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Question 223265: Substitution of an equation.
x+5y=4
3x+15y=-1
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Substitution of an equation.
x+5y=4
3x+15y=-1
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x = 4-5y
Substitute into the 2nd equation and solve for "y":
3(4-5y) + 15y = -1
12 -15y + 15y = -1
12 = 1
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This contradiction happened because we assumed the
y in one equation equaled the y in the other; they
are not the same. The system is said to be inconsistent.
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There is no solution. Graphing will show the lines
are parallel.
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Cheers,
Stan H.
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