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20 February, 20:39

Error Analysis The solution shown for the equation is

incorrect. What is the correct solution? What is the error?

- 5 (3-r) = 30

- 15 - 5r = 30

- 5r = 45

r = - 9

The solution is

(Type the value of r.)

+3
Answers (2)
  1. 20 February, 21:05
    0
    -5 (3-r) = 30

    Distribute the - 5

    -5*3 + - 5*-r = 30

    -15+5r=30

    Add 15 to both sides

    5r=45

    Divide both sides by 5

    r=9

    The mistake was made while distributing. The error was - 5*-r should be 5r, not - 5r.
  2. 20 February, 21:09
    0
    they did not distribute correctly, it should be plus 5r not - 5r

    r = 9

    Step-by-step explanation:

    - 5 (3-r) = 30

    Distribute

    -15 + 5r = 30

    The error is here

    they did not distribute correctly, it should be plus 5r not - 5r

    Add 15 to each side

    -15+15 + 5r = 30+15

    5r = 45

    Divide each side by 5

    5r/5 = 45/5

    r = 9
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