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maks197457 [2]
3 years ago
8

Which statements are true about the ordered pair (1,2) and the system of equations? y=-2x+4 7x-2y=3 select all that apply. A.Whe

n (1,2) is substituted into the second equation,the equation is true. B.The ordered pair (1,2) is not a solution to the system of linear equations. C.When (1,2) is substituted into the second equation, the equation is false. D.When (1,2) is substituted into the first equation , the equation is false. E. The ordered pair (1,2) is a solution to the system of linear equations. F. When (1,2) is substituted into the first equation, the equation is true
Mathematics
1 answer:
arlik [135]3 years ago
5 0
Y = -2x + 4
7x - 2y = 3

A. True
B. False
C. False
D. False
E. True
F. True
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Answer:

<u>______________________________________________________</u>

<u>TRIGONOMETRY IDENTITIES TO BE USED IN THE QUESTION :-</u>

For any right angled triangle with one angle α ,

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<u>SOME GENERAL TRIGNOMETRIC FORMULAS :-</u>

  • <u></u>\sin \alpha = \frac{1}{cosec \: \alpha }  or  cosec \: \alpha  = \frac{1}{\sin \alpha }
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<u>______________________________________________________</u>

Now , lets come to the question.

In a right angled triangle , let one angle be α (in place of theta) .

So , lets solve L.H.S.

\cos (90 - \alpha ) \times cosec(90 - \alpha )

=> sin\alpha  \times \sec\alpha

=> \sin\alpha  \times \frac{1}{\cos\alpha }

=> \frac{\sin\alpha }{\cos\alpha }

=> \tan\alpha = R.H.S.

∴ L.H.S. = R.H.S. (Proved)

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Answer

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Step-by-step explanation:

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Step-by-step explanation:

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