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grigory [225]
2 years ago
11

Which of the following equations shows how substitution can be used to solve the following

Mathematics
1 answer:
slega [8]2 years ago
8 0

Answer:

Step-by-step explanation:

the  y=   equation shows how... b/c we can just plug y into the 2nd equation and eliminate y and have one variable, x , to solve for  :)

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Answer:

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Step-by-step explanation:

Given the logarithmic equation

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First, notice that

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So, there is no possible solutions, all possible solutions will be extraneous.

Solve the equation:

\log_4x+\log_4(x-3)=\log_4x(x-3),

then

\log_4x(x-3)=\log_4(-7x+21)\\ \\x(x-3)=-7x+21\\ \\x^2-3x+7x-21=0\\ \\x^2+4x-21=0\\ \\D=4^2-4\cdot 1\cdot (-21)=16+84=100\\ \\x_{1,2}=\dfrac{-4\pm 10}{2}=-7,\ 3

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