algebra

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how do you work this problem ????

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X+(-9)=-5

  • algebra -

    x + (-9) = -5
    x = -5 + 9
    x = 4

  • algebra -

    but why does X = -5 +9

  • algebra -

    If A = B, then that implies that:

    A + a = B + a

    for any number a.

    So, if

    X + (-9) = -5

    then choosing a = 9 we get:

    X + (-9) + 9 = -5 + 9

    Since (-9) + 9 = 0 we have

    X = -5 + 9

  • algebra -

    You need to get the unknown on one side of the equation and the knowns on the other side. To do that you subtract -9 from the left side, change the sign and add it to the right side.

  • algebra -

    i still don't get it

  • algebra -

    ii still don't get it

  • algebra -

    Let's try this.

    X+(-9)=-5

    Remember, you can do anything to an equation as long as you do it to both sides. We want to get X (the unknown) on one side and the numbers on the other with the = sign between.
    So, remove the parentheses first to obtain (remember that a + sign in front of the parentheses leaves the sign of the numbers inside the parentheses unchanged--conversely, a - sign in front of the parentheses changes all the signs inside the parentheses when the parentheses are removed).
    X - 9 = -5
    Now add +0 to both sides.
    X-9+9 = -5+9
    Now combine the numbers
    -9 and +9 add to zero on the left while -5 and +9 add to +4 on the right.
    X = +4.
    That is the way to move anything from one side to the other. If you wish to move a + number simply subtract that number from both sides; if you wish to move a - number simply add that number to both sides. An easier way is to move anything from one side to the other by moving it and changing the sign.
    I hope this helps.

  • algebra -

    yes thanx now i get it

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