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Help 8

 Feb 27, 2018
 #1
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8.  

 

The numerator  is

 

[ xy + 4x ]  / y

 

So we have

 

[ xy + 4x] / y   *   [ 3x] / 7  =

 

[ 3x^2y + 12x^2  /  [ 7y]  =

 

3x^2 [ y + 4 ]

___________

        7y

 

9.

 

-2                         4 

___         =       ____            cross-multiply

x + 4                 x + 3

 

 

-2 ( x + 3)  = 4(x + 4)

 

-2x - 6  =  4x + 16      add 2x , 6 to both sides

 

6x + 22  = 0

 

6x  = -22

 

x =  -22/6   =  -11/3

 

 

 

 

cool cool cool

 Feb 27, 2018

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