Question

Resolvam essas equações pra mim pfvv !!! '-'

A)6x-340=4x+120
B)10x-81=x+9
C)x+7=-3x+28
D)2x-10=-3x+40

Answer 1

$a)6x-340=4x+120 \\ 6x-4x=120+340 \\ 2x=460 \\ x= \frac{460}{2} \\ x=230$


$b)10x-81=x+9 \\ 10x-x=9+81 \\ 9x=90 \\ x= \frac{90}{0} \\ x=10$


$c)x+7=-3x+28 \\ x+3x=28-7 \\ 4x=21 \\ x= \frac{21}{4} \\ ou x=5,25$


$d)2x-10=-3x+40 \\ 2x+3x=40+10 \\ 5x=50\\ x= \frac{50}{5} \\ x=10$

Answer 2

A)6x-340=4x+120
6x-4x = 120 + 340
      2x =   460 
          x =  460:2
          x =   230

B)10x-81=x+9
   10x-x = 9 - 81
    9x  =  72
        x = 72:9
        x=8

C)x+7=-3x+28
   x +3x = 28 -7
       4x  =  21
        x   =  21:4
        x   =  21/4 (em fração)

D)2x-10=-3x+40
 2x+3x = 40+10
   5x     = 50
        x  = 50:5
        x  = 10