SOLUTION: 2x+7=15 x/3-5=-1 30=16+1/5x 7+2/3x=-1 22=18-1/4x -7x+4x=9 3x-7+x=5 12(2-x)=6 -4/9(2x-4)=48 4x/3+3=23 -10=1/2x+x 55x-3(9x+12)=-64 9x-5(3x-12)=30

Algebra ->  Equations -> SOLUTION: 2x+7=15 x/3-5=-1 30=16+1/5x 7+2/3x=-1 22=18-1/4x -7x+4x=9 3x-7+x=5 12(2-x)=6 -4/9(2x-4)=48 4x/3+3=23 -10=1/2x+x 55x-3(9x+12)=-64 9x-5(3x-12)=30       Log On


   

Question 548526: 2x+7=15
x/3-5=-1
30=16+1/5x
7+2/3x=-1
22=18-1/4x
-7x+4x=9
3x-7+x=5
12(2-x)=6
-4/9(2x-4)=48
4x/3+3=23
-10=1/2x+x
55x-3(9x+12)=-64
9x-5(3x-12)=30
Please help me out its my first year in algebra and my teacher doesn't help us at all and wont show us how to work the problems I'm really stumped
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
2x + 7 = 15 
   - 7   -7
-----------
2x     =  8
2x%2F2 = 8%2F2
      x = 4
     


x%2F3 - 5 = -1
3·%28x%2F3%29 - 3·(5) = 3·(-1)
 x - 15 = -3
    +15  +15
------------
 x      = 12    
 


30 = 16 + 1%2F5x 
5·(30) = 5·(16) + 5·1%2F5x
150 = 80 + x
-80  -80
------------
 70 =      x



7 + 2%2F3x = -1
3·(7) + 3·(2/3)x = 3·(-1)
 21 + 2x =  -3
-21        -21
--------------
      2x = -24
     2x%2F2 = %28-24%29%2F2
       x = -12
 


22 = 18 - 1%2F4x
4·(22) = 4·(18) - 4·1%2F4x
 88 = 72 - x
-72  -72
------------
 16 =     -x
 16 = -1x
16%2F%28-1%29 = %28-1x%29%2F%28-1%29
-16 = x 
 


 -7x + 4x = 9 
      -3x = 9
      %28-3x%29%2F%28-3%29 = 9%2F%28-3%29
        x = -3



3x - 7 + x =  5 
    4x - 7 =  5
        +7 = +7
----------------
    4x     = 12 
    %284x%29%2F4 = 12%2F4
         x = 3



12(2 - x) =   6
 24 - 12x =   6
-24         -24 
---------------
     -12x = -18
     %28-12x%29%2F%28-12%29 = %28-18%29%2F%28-12%29
        x = 18%2F12
        x = 3%2F2
       


-4%2F9(2x - 4) = 48 

9·%28-4%2F9%29(2x - 4) = 9·(48)
-4(2x - 4) = 432
  -8x + 16 = 432
       -16   -16
----------------
  -8x      = 416
       %28-8x%29%2F%28-8%29 = 416%2F%28-8%29
         x = -52 
 


4x%2F3 + 3 = 23
3·%28%284x%29%2F3%29 + 3·3 = 3·23
        4x + 9 = 69
           - 9   -9
       -------------
        4x     = 60
          %284x%29%2F4 = 60%2F4
             x = 15 
              


 
    -10 = 1%2F2x + x
2·(-10) = 2·(1%2F2x) + 2·x
    -20 = 1·x + 2·x
    -20 = 3x
    %28-20%29%2F3 = 3x%2F3
     -20%2F3 = x 
 
 


55x - 3(9x + 12) = -64 
  55x - 27x - 36 = -64 
        28x - 36 = -64
            + 36 = +36
       ---------------
        28x      = -28
            %2828x%29%2F28 = %28-28%29%2F28
               x = -1



9x - 5(3x - 12) = 30
  9x - 15x + 60 = 30
       -6x + 60 =  30
            -60 = -60
       --------------
       -6x      = -30
            %28-6x%29%2F%28-6%29 = %28-30%29%2F%28-6%29
              x = 5

Edwin