CookieMonster18
  • CookieMonster18
For the equation -4y=8x what is the constant or variations? A.-4 B.-2 C.1 D.2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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CookieMonster18
  • CookieMonster18
I think it's A am I correct?
yeval76
  • yeval76
Yea its A
anonymous
  • anonymous
yea

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More answers

CookieMonster18
  • CookieMonster18
Can you help with 3 more?
Nnesha
  • Nnesha
solve for y
Nnesha
  • Nnesha
equation for direct variation is `y=kx` equation for inverse variation is `y=k/x` where k is constant of variation
CookieMonster18
  • CookieMonster18
suppose y varies directly with x, and y=24 when x=8 what is the value of y when x=10? A.10 B.30 C.80 D.240 (I think C am I correct?) @Nnesha @ransondyara471 @yeval76
Nnesha
  • Nnesha
what did you get for first one ?
Nnesha
  • Nnesha
nd no direct variation y =kx plugin x =8 y=24 and then solve for k(constant of variation )
CookieMonster18
  • CookieMonster18
@Nnesha can you teach/show me how to get the answer ik you already did but I still don't understand how to solve to get the answer can you do it in steps please
Nnesha
  • Nnesha
for first one can you solve for y ?
Nnesha
  • Nnesha
how would you cancel out -4 from left side \[\large\rm -4y=8x\]?
Nnesha
  • Nnesha
no we don't need to add
Nnesha
  • Nnesha
it's -4 times y so to cancel out -4 do opposite of multiplication
Nnesha
  • Nnesha
opposite of multiplication is ??
CookieMonster18
  • CookieMonster18
division
Nnesha
  • Nnesha
right divide both sides by -4
CookieMonster18
  • CookieMonster18
-4/-4=1 8/-4=-2
Nnesha
  • Nnesha
correct!
CookieMonster18
  • CookieMonster18
so for the first one the correct answer is -2? and not -4?....
CookieMonster18
  • CookieMonster18
@Nnesha
Nnesha
  • Nnesha
yes
CookieMonster18
  • CookieMonster18
can you help me with the second one @Nnesha
Nnesha
  • Nnesha
what's the equation for `direct variation` ?
CookieMonster18
  • CookieMonster18
y=kx??
Nnesha
  • Nnesha
correct replace x and y for their values then solve for k
Nnesha
  • Nnesha
`y=24 when x=8 ` y=kx
CookieMonster18
  • CookieMonster18
so i'd divide 24 by??? k, but what is k. how do I find it? @Nnesha
Nnesha
  • Nnesha
first replace y with 24 and x with 8 to solve for k would you move 8 to the left side or 24 to the right side ?
CookieMonster18
  • CookieMonster18
8 to the right? 24/8=3 24/24=1
Nnesha
  • Nnesha
wayes 3 is the constant of variation
Nnesha
  • Nnesha
what do you mean by 24/24
Nnesha
  • Nnesha
\[\rm 24=8k\] divide both side by 8 you get k=3 now substitute k for 3 and x for 10 solve for y
CookieMonster18
  • CookieMonster18
I'm confuse. So itll be B. 30 for the answer
Nnesha
  • Nnesha
yes correct \[\rm y=kx\] k=3 so when x=10 y=? we should replace x with 10 and k with 3 then multiply
CookieMonster18
  • CookieMonster18
thank you. I had no idea how to solve problems like these I somewhat just learned how to do it a little. I'm not a pro but I some what know a little bit of what to do
Nnesha
  • Nnesha
yeah practice will help you to learn it:=))

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