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8090 [49]
3 years ago
7

-x+y=5

Mathematics
2 answers:
photoshop1234 [79]3 years ago
7 0

Answer:

x=-37/3

y=-22/3

Step-by-step explanation:

-2x+2y=10 (1)

2x-5y=12 (2)

(1)+(2) <=> -3y=22

tatyana61 [14]3 years ago
7 0

Answer:

Elimination method is good enough

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The particular identity you want to use is

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Then

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Expand the binomial to get

3\cos^4x=\dfrac34\left(1+2\cos(2x)+\cos^2(2x)\right)

Use the identity again to write

\cos^2(2x)=\dfrac{1+\cos(4x)}2

and so

3\cos^4x=\dfrac34\left(1+2\cos(2x)+\dfrac{1+\cos(4x)}2\right)

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4 years ago
X² + y² − 10x + 6y − 47 = 0.
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Help on 7 and 8b please and thank you.
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sashaice [31]

Answer:

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Warner used 75 of the printer paper .

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