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Komok [63]
3 years ago
5

Which expression is equivalent to -1?

Mathematics
1 answer:
creativ13 [48]3 years ago
7 0
Hello,
Answer B

If x≠y then
\dfrac{x-y}{-x+y}=\dfrac{x-y}{-(x-y)}=-1


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What is the substitution of -6x-8y=-20 and x+6y=-6
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Substitution doesn't work for this, but elimination does.

-6x-8y=-20 +6( x+6y=-6)

-6x-8y=-20 + 6x+36y=-36

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28y=-56

divide by 28 on both sides.

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Then substitute y into one of the equations.

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3 years ago
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The given expression is :

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Aleena expands 2xx+3-5(x-2) as 2x²+3-5x-10. She is mistaken because the sign before 10 should be +10 instead of -10. Hence, the correct expanded form is 2x²+3-5x+10. Hence, this is the required solution.

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Step-by-step explanation:

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