Question

How to solve 28,32and34

Answer 1

28.) -3 | r + 4| = -21...divide both sides by -3
            | r + 4 | = -21/-3
            | r + 4 | = 7

r + 4 = 7        -(r + 4) = 7
r = 7 - 4          -r - 4 = 7
r = 3                -r = 7 + 4
                       -r = 11
                        r = -11

solution is : r = 3 or r = -11
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32. ) 4| 7y + 2 | - 8 = -7....add 8 to both sides
        4 | 7y + 2 | = -7 + 8
         4| 7y + 2 | = 1 ...divide both sides by 4
          | 7y + 2 | = 1/4

7y + 2 = 1/4                                  -(7y + 2) = 1/4
7y = 1/4 - 2                                   -7y - 2 = 1/4
7y = 1/4 - 8/4                                 -7y = 1/4 + 2
7y = -7/4                                        -7y = 1/4 + 8/4
y = -7/4 * 1/7                                  - 7y = 9/4
y = - 7/28 reduces to - 1/4              y = 9/4 * -1/7
                                                        y = - 9/28

solution is : y = -1/4 or y = -9/28
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34.) I cant see this one