Question

1) Resolva as equações:

a) 3X - 10 = 2X

b) 3Y - 20 = Y + 80

c) 5(X - 2) = 4 - ( -2X - 1 )

d) 12 - 5X = X

Answer 1

a) 3x-10=2x
3x-2x=10
x=10

b) 3y-20=y+80
3y-y=+20+80
2y= 100
  y= 100/2
  y=50

c) 5(x-2)= 4-(-2x-1)
    5x -10 = 4-2x -1
    5x + 2x = 10+4-1
    7x = 13
      x= 13/7

d) 12-5x = x 
     -5x -x = -12
     - 6x = -12 (-1)
       6X = 12
         x = 12/6
         x = 2