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GarryVolchara [31]
3 years ago
9

If x^2 +2xy -8 = 0, then when x = 4, dy/dx =

Mathematics
2 answers:
Tasya [4]3 years ago
6 0
The correct answer is E, hope I am right!
Katena32 [7]3 years ago
3 0
For simplicity, dy/dx means f'(x);
We have y = ( 8 - x^2 ) / 2x;
Then, y = 4/x - x/2;
So, f'(x) = (4/x - x/2)' = (4/x)' - (x/2)' = -4/(x^2) -1/2 because we use <span> d<span>ifferentiation formulas, such as : (f+g)' = f' + g'; (cf)' = cf'; x'=1; (1/x)' = -1/(x^2);
</span></span>Finally, f'(4) = -4/16 -1/2 = -4/16 - 8/16 = -12/16 = -3/4.
The correct answer is E.
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Solve the system of equations.<br><br> −4x+3y=−2<br> y=x−1<br><br> x-<br> y-<br> ​
Kobotan [32]

Answer: x=  -1

               y= -2

Step-by-step explanation:

-4x+3y= -2

y=x-1

-------------------

-4x+3(x-1)= -2

-4x+3x-3= -2

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6 0
3 years ago
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I need help with 5-9
Goryan [66]

Answer:

5) x = 1, y = -3

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8) no solutions

Step-by-step explanation:

5)

y = 5x - 8

y = -6x + 3

5x - 8 = -6x + 3

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6)

2x + 10y = -20

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18 = 9y

2 = y

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7)

this has infinite solutions because one equation is a simplified version of the other

8)

this has no solutions because 5 does not equal -5

9)

I can't graph on brainly, hope this helped though

3 0
2 years ago
Log 54 round to the nearest thousand. <br><br>I got 1.73239
Nonamiya [84]

Type into your calculator (if you haven't already): log 54.


My result: was similar to yours.


Note, however, that we're supposed to round off these results to the nearest thousandths (not thousand).


Your 1.73239 would need to be rounded off to 1.732, with 2 being the nearest thousandths.




7 0
2 years ago
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Oksi-84 [34.3K]
4.16lbs of apple divided by $5.20 would equal $0.80 a lb.
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ziro4ka [17]

I think the answer is 30 because difference means subtract


8 0
3 years ago
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