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4 years ago

Determine whether y varies directly with x. y-2x=0

2 answers:

4 0

hi, 
you can determine it by seeing if y/x = a constant value, in other words if y = (a constant value) x 
then you say that y varies directly with x, and you can see that : call the constant k 
then y/x is supposed to be k in all values 
6/3 = 2 
24/12 =2 
96/48 = 2 
384/192 = 2 
it worked the ratio between x and y is constant so y varies directly with x ( y = 2x) and that constant k =2 
p.s. you can also say that x varies directly with y but in that case it becomes x/y =constant and that constant say c is 1/2 (x = (1/2)y)) 
hope u understand.

Source- https://answers.yahoo.com/question/index?qid=20110813112602AApHZtQ

alexgriva [62]4 years ago

4 0

No because when y is next to a number you mutiply and y you do what ever its next to

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Why is 5 to the second power read as "five squared"?

Dmitriy789 [7]

Squared is just another way of saying to the power of two, just like how a 5 to the power of 3 is also called five cubed.

6 0

4 years ago

Got a calc 1 question,

belka [17]

$v=\dfrac h{3x}\implies\dfrac{\mathrm dv}{\mathrm dt}=\dfrac{3x\frac{\mathrm dh}{\mathrm dt}-3h\frac{\mathrm dx}{\mathrm dt}}{3x^2}$

By the chain rule,

$\dfrac{\mathrm dh}{\mathrm dt}=\dfrac{\mathrm dh}{\mathrm dx}\dfrac{\mathrm dx}{\mathrm dt}$

We have

$h(x)=4e^{2x-6}-x^2+5\implies\dfrac{\mathrm dh}{\mathrm dx}=8e^{2x-6}-2x$

and we're given that $x$ changes at a constant rate of $\frac{\mathrm dx}{\mathrm dt}=0.2$ thousand people per minute, which means

$\dfrac{\mathrm dv}{\mathrm dt}=\dfrac{3x\left(8e^{2x-6}-2x\right)\left(0.2\frac{\text{thousand people}}{\rm min}\right)-3h\left(0.2\frac{\text{thousand people}}{\rm min}\right)}{3x^2}$

At the moment $x=4$ thousand people are in the park, we have $h(4)=4e^2-11$ , so we find

$\dfrac{\mathrm dv}{\mathrm dt}=\dfrac{12\left(8e^2-8\right)-3(4e^2-11)}{240}\dfrac{\text{thousand people}}{\rm min}=\dfrac{7(4e^2-3)}{80}\dfrac{\text{thousand people}}{\rm min}$

or approximately 2.324 thousand people per minute.

5 0

4 years ago

WILL GIVE BRAINLIEST

OLEGan [10]

Answer:

C) 2x10²

Step-by-step explanation:

1400000/7000=

1400/7=

200=

2x10²

3 0

3 years ago

Read 2 more answers

Which coordinate pair is (3,16) reflected across the y-axis?

seraphim [82]

Answer:

(-3, 16)

Step-by-step explanation:

If it is reflected off the y - axis, the x coordinates change.

It becomes (-3, 16)

4 0

4 years ago

Read 2 more answers

B.y = 4x + 2 y = -8x + 8

Inessa05 [86]

$y = 4x + 2 \\ = > y - 2 = 4x \\ = > x = \frac{y - 2}{4}$

$y = - 8x + 8 \\ = > y = - 8( \frac{y - 2}{4} ) + 8 \\ = > y = \frac{ - 8y + 16}{4} + 8 \\ = > y = \frac{ - 8y + 16 + 32}{4} \\ = > y = \frac{ - 8y + 48}{4} \\ = > 4y = - 8y + 48 \\ = > 4y + 8y = 48 \\ = > 12y = 48 \\ = > y = 4$

$y = 4x + 2 \\ = > 4 = 4x + 2 \\ = > 4x = 4 - 2 \\ = > 4x = 2 \\ = > x = \frac{2}{4} = \frac{1}{2}$

Answer:

$x = \frac{1}{2} \\ y = 4$

Hope you could understand.

If you have any query, feel free to ask.

4 0

3 years ago

Read 2 more answers