Pre Algerbra: x/-8 - 9 = 3?

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  • 1 decade ago
    Favorite Answer

    OK, this is just like the last one. We need to have everything have an 8 on the bottom, so we use fractions. When you make everything have an 8 on the bottom, you get this equation:

    -x/8 -72/8=24/8

    Again, we take the top numbers to make a new equation, which reads:

    -x-72=24

    -x=24+72

    -x=96

    x= -96

    We then put our number back into the original equation to check our math.

    -96/-8 -9=3

    12-9=3

    3=3

  • 1 decade ago

    x/-8 - 9 = 3

    x/-8 = 3 + 9

    x = 12 x -8

    x = -96

    By substitution :

    (-96/-8) - 9 = 3

    12 - 9 = 3

    3 = 3

  • 1 decade ago

    okay the problem is

    x/-8 - 9 = 3

    + 9 +9 You want to get the x by it's self so you do the opposite

    x/-8 = 12 The nines cancell each other out on the left and the right equals 12

    Now you want to do the opposite of division which is multiplication. If you do it on one side, you must do it on the other side.

    (-8) * x/-8 = 12 * (-8)

    The -8s cancell out on the left so all you have left is x and 12*(-8) equals -96.

    x= -96

    Now all you have left is to do the check and substitute the answer into the equation.

    Hope that this helps. I teach this everyday!

    Source(s): 8th grade Math teacher
  • 1 decade ago

    To solve for x, you should add 9 and then multiply by -8 on both sides.

    x/-8 - 9 + 9 = 3 + 9

    x/-8 = 12

    (x/-8) * -8 = 12 * -8

    x = -96

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  • Anonymous
    1 decade ago

    if you're asking what x equals the answer is -96.

    solution:

    *add 9 to 3 to make the solution x/-8 = 12

    *multiply both sides by -8 to cancel the -8 in the denominator

    x = 12(-8)

    *then just mulitply it out.

  • Anonymous
    1 decade ago

    4

  • Anonymous
    4 years ago

    ok. Use the pronumeral "x" for something you don't understand. a million. you understand the cost after 20% is taken off. 20% = 0.2 as a result, use the equation: 40 8=x-0.2x 40 8=0.8x x=40 8/0.8 (use a calculator) x=60 2. signify the width with x. Perimeter = width + width + length + length. length = width - 4cm. sixty 4=x+x+x-4+x-4 sixty 4=4x-8 sixty 4+8=4x-8+8 seventy two=4x x=seventy two/4 x=18 width = 18cm, length = 14cm. 3.a. 0.9x = 23 (x is comparable to the load on earth) x=23/0.9 x=25.55555 b. 25.55555 * 13/5 = sixty six.444442

  • Anonymous
    1 decade ago

    x/-8 - 9 = 3

    +9 +9

    x/-8 = 12

    *-8 *-8

    x= -96

    Source(s): im in algebra
  • 1 decade ago

    x

    _-9=3

    8

    -9

    +9(they then cancel out)

    Then you add 9 to 3 and you get a +12

    Then you take -8 and multiply it by 12

    the answer would be -96

    Source(s): Algebra 2
  • 1 decade ago

    x/-8 -9 =3

    add 9: x/-8 = 12

    multiply each side by -8: x= -96

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