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23 October, 01:34

Using the equation y = 2x + 5, what would the input need to be for an output of - 45?

a. - 20

b. - 25

c. - 85

d. - 95

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Answers (2)
  1. 23 October, 02:33
    0
    -25

    Step-by-step explanation:

    Essentially, y is your output and x is your input.

    Here's your base equation: y = 2x + 5

    Knowing the information above, let's plug it in:

    -45 = 2x + 5

    (Subtract 5 from both sides)

    -50 = 2x

    (Divide both sides by 2 to isolate x)

    -25 = x

    And there you go.
  2. 23 October, 04:34
    0
    input is - 25

    Step-by-step explanation:

    y = 2x + 5

    The output is - 45 which is y

    -45 = 2x + 5

    Subtract 5 from each side

    -45-5 = 2x

    -50 = 2x

    Divide each side by 2

    -50/2 = 2x/2

    -25 = x
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