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Elanso [62]
3 years ago
5

Which one is it?? (btw the negative answer isn't right.)

Mathematics
1 answer:
Semmy [17]3 years ago
4 0

Answer:

A

Step-by-step explanation:

Rule: a Minus power always goes to the opposite place to where it is. If it is in the denominator, it goes to the numerator. If it is the numerator, it goes to the denominator. The minus power does not affect the sign of the expression.

So you are right. The minus power does not give a minus answer.

\dfrac{y^{-2}}{3y^4}=\dfrac{1}{3y^2y^4}=\dfrac{1}{3y^{(2 + 4)}} = \dfrac{1}{3y^6}

Answer: A


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Solve the system of equations 2x+4y+3z=6 5x+8y+6z=4
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Answer:Solution :

{x,y,z} = {-8,52/7,-18/7}  

 

System of Linear Equations entered :

  [1]    2x + 4y + 3z = 6

  [2]    5x + 8y + 6z = 4

  [3]    4x + 5y + 2z = 0

Solve by Substitution :

// Solve equation [3] for the variable  z  

 

 [3]    2z = -4x - 5y  

 [3]    z = -2x - 5y/2  

// Plug this in for variable  z  in equation [1]

  [1]    2x + 4y + 3•(-2x-5y/2) = 6

  [1]    -4x - 7y/2 = 6

  [1]    -8x - 7y = 12

// Plug this in for variable  z  in equation [2]

  [2]    5x + 8y + 6•(-2x-5y/2) = 4

  [2]    -7x - 7y = 4

// Solve equation [2] for the variable  y  

 

 [2]    7y = -7x - 4

 [2]    y = -x - 4/7

// Plug this in for variable  y  in equation [1]

  [1]    -8x - 7•(-x -4/7) = 12

  [1]    -x = 8

// Solve equation [1] for the variable  x  

  [1]    x = - 8  

// By now we know this much :

   x = -8

   y = -x-4/7

   z = -2x-5y/2

// Use the  x  value to solve for  y  

   y = -(-8)-4/7 = 52/7  

// Use the  x  and  y  values to solve for  z  

 z = -2(-8)-(5/2)(52/7) = -18/7  

Solution :

{x,y,z} = {-8,52/7,-18/7}  

Step-by-step explanation:

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