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Math Help - Evaluating..

  1. #1
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    Evaluating..

    4. 3x(x-2) If x=6

    5. 4x - y If x = 3 and y = 2. There is a line btw 4x and 3x like a fraction line :s
    3x - y

    Evaluating..-photo-2-.jpg

    Pic above shows the problems
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  2. #2
    Senior Member Educated's Avatar
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    What have you tried?

    4. Just substitute in 6 where ever there is an x. Then solve.

    5. The same thing, where ever there is an x, substitute in 3 and for y, substitute in 2.
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  3. #3
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    Quote Originally Posted by Educated View Post
    What have you tried?

    4. Just substitute in 6 where ever there is an x. Then solve.

    5. The same thing, where ever there is an x, substitute in 3 and for y, substitute in 2.
    Ok so..
    4. 36(6-2)
    5. 42-2=40
    33-2=31
    Do you simplify?
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  4. #4
    Senior Member Educated's Avatar
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    They are not correct.

    Whenever there is a number beside a letter, it means multiply.

    So for number 4 it's 3 \times x \times (x-2)
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  5. #5
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    4. 3 x 6(6-2) ?
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  6. #6
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    Quote Originally Posted by bdubb View Post
    4. 3 x 6(6-2) ?
    Yes, and now you are expected to simplify this to get a single number as the final answer.
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  7. #7
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    4. 3 x 6(6-2) = 72
    5. 4 x 3 - 2 =10
    3 x 3 -2 =7

    Correct?
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  8. #8
    Junior Member RHandford's Avatar
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    Hi

    Yes the first one is correct at 72.

    For the second you are almost there, what you should have is:

    \frac{4x-y}{3x-y} = \frac{(4 *3)-2}{(3*3)-2} = \frac{12-2}{9-2} = \frac{10}{7} \equiv  1\tfrac{3}{7} \equiv 1.429

    Hope this helps
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