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ivolga24 [154]
3 years ago
9

How is -5x + 2y = 9 is not constant of variation

Mathematics
2 answers:
nadya68 [22]3 years ago
7 0
A constant of variation is only in the form ay=bx where b/a=constant so given any point y/x=constant let us check here by substituting x=1 and x=2
when x=1---> 2y=14,y=7 here y/x=7
when x=2--->2y=19,y=9.5 here y/x=4.75
so this equation is not constant of variation
let us check an equation of the form 3y=7x
when x=1--->y=7/3--->y/x=7/3
when x=2--->y=14/3---->y/x=7/3
so 3y=7x is a constant of variation
sukhopar [10]3 years ago
4 0
Yes because there is no constant
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notka56 [123]
We have no dimensions to work with. I'll pick some and try and comply with the conditions of the problem. 

Suppose you have an object that is 14 by 22 by 27 cm. These three numbers have no common factor so they cannot be reduced any further, which is helpful for this problem.

Find the Volume
Volume

l = 27 cm
w = 14 cm
h = 22 cm

V = 27 *14 * 22
V = 8316 cm^3

Find the surface area
SA = 2*l*w + 2*l*h  + 2*w*h
SA = 2*27*14  +  2*27*22   +  2*14*22
SA = 756 + 1188 + 616
SA = 2558

Just looking at these numbers The surface area is about 1/3 of the volume. I don't think this is always true.


 \frac{SA}{V} =  \frac{2*L*W  + 2*L*H + 2*W*H}{L*W*H} 

Another way to do this is to consider a cube which might give you a more useful result. 

s = L = W = H all three dimensions are equal in a cube.
The volume of a cube is s*s*s = s^3
The surface area of a cube is 2*s*s + 2*s*s + 2s*s = 6s^2

\frac{SA_cube}{V_cube} =  \frac{6s*s}{s*s*s}
\frac{SA}{V} =  \frac{6}{s}

That means whatever the side length, the Surface Area to volume = 6/the side length which is kind of an interesting result.


4 0
3 years ago
What is 70 percent of 20?
RideAnS [48]

Answer:

14

Step-by-step explanation:

All you need to do is turn 70% into a decimal which is .70

Then multiply .70 and 20

.70*20

which gives you 14

4 0
3 years ago
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Jack is going to the fair. The fair charges $10 to enter and $0.25 per ticket. How much will be spent by Jack? t = tickets 0.25
Alborosie
Hello

there is a base charge of 10 (+10)
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10+0.25t

hope this helped :)

4 0
3 years ago
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You work as a taxi driver. You are in an average of $75 in tips every day.
Artyom0805 [142]

Answer:

A

Step-by-step explanation:

If you get the same amount each day then the graph line would be straight.

4 0
3 years ago
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What is the variation constant for an inverse squared relationship where we know x = –4 and y = 3?
stich3 [128]
Let the constant be k.

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Insert values of y and x into the formula.
3 = k/(-4)^2
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Hope this helps. :)
6 0
3 years ago
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