martes, 20 de marzo de 2012

ECUACIONES DE PRIMER GRADO

  1. x + 4 = 28  x=28-4
    x=24
  2. y - 6.5 = 31y=31+6.5
    y=37.5
  3. 8z = 40 + 3z8z+3z=40
    5z=40
    z=40/5
    z=8
  4. 10x = - 5x + 60
    10x+5x=60
    15x=60
    x=60/15
    x=4

  5. - 15y + 3 = - 36 - 18y
    -15y+18y=-36-3
    3y=-39
    y=-39/3
    y=-13
  6. 2x + 4 + (3x - 4) = 3x + 122x+4+3x-4=3x+12
    5x=3x+12
    5x-3x=12
    2x=12
    x=12/2
    x=6
  7. 4(3x + 2) - 8 = 5(2x + 3) + 512x+8-8=10x+15+5
    12x=10x+20
    12x-10x=20
    2x=20
    x=20/2
    x=10
  8. 15x - 40 - 5x - 20 = 010x-60=0
    10x=-60
    x=-60/10
    x=-6
  9. 16 - ( - 2x - 4) - (5x - 3x + 2) = - 4x - ( - 8x + 2)16+2x+4-5x+3x-2=-4+8x-2
    18=-2+4x
    4x=-20
    x=-20/4
    x=-5
  10. - (7x - 2 + 12) + ( - 5x - 3x + 4) = - ( - x + 7) - (6x - 4 - 7)-7x+2-12-5x-3x+4=x-7-6+4+7
    -15-6=-5x+4
    -15x+5x=4+6
    10x=10
    x=10/10
    x=1
  11. - 18 - [ 3(x + 2) + 4] = 21 - [ 6( - 2x - 2) + 1]-18-3(X+2)+4=21-6(-2X-2)+1
    -18-3X-6+4=21+12x+12+1
    -3x-20=12x+34
    -3x-12x=34+20
    -15x=54
    x=54/15
    x=18/5

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