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Iteru [2.4K]
3 years ago
15

If y varies inversely with x, find the constant of variation x= -40 and y= 4

Mathematics
1 answer:
Daniel [21]3 years ago
8 0

Answer:

y=\frac{-160}{x}, \ \ \ \ k=-160

Step-by-step explanation:

let k be a constant written as:

y=\frac{k}{x}

It is given that y=4, x=-40

#We substitute x, y values in our function:

y=\frac{k}{x}\\\\4=\frac{k}{-40}\\\\k=4\times-40\\\\k=-160

We substitute the constant value in the equation:

y=\frac{k}{x}, k=-160\\\\y=\frac{-160}{x}

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Solve the equations for y.<br> 1) x+y=2<br> 2) 4x+2y=8<br> 3) y-3=0
umka21 [38]

Answer:

Y=3

Step-by-step explanation:

-1= 1/2

1/2=-1

x=-1

y=3

Hope this helps!

5 0
3 years ago
Y=1/2x+3<br> -x+27=-6 <br><br> solve using substitution
Nat2105 [25]

Answer:

y= 19.5    x=33

Step-by-step explanation:

-x + 27= -6

(subtract 27 on both sides)

-x= -33

(divide by negative 1 on both sides)

x= 33

(substitute x into the first equation)

y= 1/2x + 3

y= 1/2(33) +3

y= 16.5 +3

y= 19.5

hope this helps :))

3 0
3 years ago
A bakery sells 5 apple muffins for every 2 bran muffins.
Hunter-Best [27]

Answer:

Apple\ muffin\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Bran\ muffin\\10\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 4\\15\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 6\\20\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 8\\35\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 14

Step-by-step explanation:

For\ 5\ apple\ muffins, bran\ muffin=2\\\\Ratio\ of\ bran\ muffin\ to\ apple\ muffin=\frac{number\ of\ bran\ muffin}{number\ of\ apple\ muffin}\\\\Ratio\ of\ bran\ muffin\ to\ apple\ muffin=\frac{2}{5}\\\\Bran\ muffin=\frac{2}{5}\times apple\ muffin\\\\When\ apple\ muffin=10\\\\Bran\ muffin=\frac{2}{5}\times 10=4\\\\When\ apple\ muffin=15\\\\Bran\ muffin=\frac{2}{5}\times 15=6\\\\When\ apple\ muffin=20\\\\Bran\ muffin=\frac{2}{5}\times 20=8

When\ apple\ muffin=35\\\\Bran\ muffin=\frac{2}{5}\times 35=14

6 0
3 years ago
What is the exact circumference of the circle?
fredd [130]
Data:

Formula: diameter = 2*radius

Formula: (<span>Circle length)
</span>C = 2* \pi *r
<span>
Solving: </span><span>Using the data
</span>diameter = 2*radius
20 = 2*r
2r = 20
r =  \frac{20}{2}
\boxed{r = 10\:ft}

<span>Now, replace in the circumference length formula
</span>C = 2 \pi *r
C = 2 \pi *10
\boxed{\boxed{C = 20 \pi \:ft}}\end{array}}\qquad\quad\checkmark

Answer:
<span>The exact circumference of the circle is </span>20 \pi \:ft
7 0
3 years ago
Please help me graph #9.
Nata [24]
Hint to start out the problem:

eg. For f(4), use the first expression, (x-3)^2 because 4 is greater than 1.
4 0
3 years ago
Read 2 more answers
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