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22 August, 09:33

If 2t + 3 = - 9, what is the value of - 3t - 7?

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Answers (2)
  1. 22 August, 09:56
    0
    11

    Step-by-step explanation:

    2t + 3 = - 9 lets us solve for t by isolating the variable. first we can subtract 3 from both sides to get rid of it on the left side of the equation. That gives us 2t = - 12. Then we can divide by 2 to isolate t completely. Now we have t = - 6.

    We can use this in the 2nd equation to just plug in t. - 3t - 7 = - 3 (-6) - 7. We multiply - 3 and - 6 and get 18 because the negatives cancel out when multiplying 2 negative numbers together. The equation is now 18 - 7 which is equal to 11.
  2. 22 August, 10:11
    0
    11

    Step-by-step explanation:

    first solve 2t+3=-9 for t

    2t+3=-9 subtract 3 from both sides

    -3 - 3

    2t=-12 now divide both sides by 2

    :2 : 2

    t=-6

    now plug in - 6 for t in - 3t-7

    -3 (-6) - 7=? multiply - 3 and - 6

    18-7=?

    11
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