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13 November, 12:44

Which expressions, when evaluated with y = - 7, are positive in value?

Choose all answers that are correct.

a. 18 + 2y

b. - 3y + (-17)

c. - 2y - 23

d. - 30 - 4y

It can be more than answer

+2
Answers (1)
  1. 13 November, 16:40
    0
    If you replace y with - 7 you get:

    a. 18 + 2x-7

    b. - 3x-7 + (-17)

    c. (-2x-7) - 23

    d. - 30-4x-7

    you get:

    a. 18-14

    b. 21-17

    c. 14-23

    d. - 30+28

    this solves to:

    a. 4

    b. 4

    c. - 9

    d. - 2

    so the positive answers are a and b
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