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user100
1 month ago
10

the equation of a curve is xy=12 and the equation of a line l is 2x+y=k where k is a constant .In the case where k=11 find the c

oordinates of the points of intersection of l and the curve.
Mathematics
1 answer:
tester [12.3K]1 month ago
7 0
The equations given are xy=12 and 2x+y=11.

To find the intersection points, you can isolate one of the variables, either x or y, and substitute into the other equation. I’ll choose to express x in terms of y.

Rearranging the first equation for y gives us y=12/x.

Substituting this y value into the second equation leads to an equation with a single variable to solve for x. This results in 2x + 12/x = 11.
To eliminate the fraction, multiply both sides by x, giving...
2x^2 - 11x + 12 = 0.
From here, we can factor to get (2x-3)(x-4).
By setting both factors to zero, we can solve for x values which yields x = 3/2 and x = 4.
Next, we substitute these x values back into the original equation xy=12 to find the corresponding y coordinates. This results in the points:
(3/2, 8) and (4, 3). The curves intersect at these two locations.
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Answer:

y = \frac{3 + 6\sqrt{2} }{4} y y = \frac{3 - 6\sqrt{2} }{4}

y = StartFraction 3 + 6 StartRoot 2 EndRoot Over 4 EndFraction y = StartFraction 3 menos 6 StartRoot 2 EndRoot Over 4 EndFraction

Explicación paso a paso:

La ecuación cuadrática que tenemos es (4y - 3)² = 72

Debemos encontrar el valor de y.

Ahora, 4y - 3 = ± 6√2

⇒ 4y = 3 ± 6√2

⇒ y = \frac{3 + 6\sqrt{2} }{4} y y = \frac{3 - 6\sqrt{2} }{4}

Por lo tanto, las soluciones son y = StartFraction 3 + 6 StartRoot 2 EndRoot Over 4 EndFraction y y = StartFraction 3 menos 6 StartRoot 2 EndRoot Over 4 EndFraction (Respuesta)

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1 month ago
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A series contains 18 numbers and has a sum of 4,185. The last number of the series is 275. What is the first number?
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The formula for the sum of an arithmetic series is expressed as:
Sn=n/2(a1+an)
where:
n=total terms
a1=the initial term
an=the final term
given
n=18, an=275, Sn=4185
substituting these values into the equation results in:
4185=18/2(a1+275)
after simplification, we obtain:
4185=9(a1+275)
dividing by 9 yields:
465=a1+275
therefore
a1=465-275
a1=190

Conclusion: the first term is 190
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If the minimum biking days are set to be 15, indicated by y = 15, we have:

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Solving for x gives:
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