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25 November, 09:04

R = 2j - 20

r + j = 85

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Answers (2)
  1. 25 November, 11:28
    0
    R=2j-20

    r+j=85

    j=85-r

    j=85 - (2j-20)

    j=85-2j+20

    j+2j=105

    3j/3=105/3

    j=35

    r=2j-20

    r=2*35-20

    r=50
  2. 25 November, 11:54
    0
    So if r=2j-20 then subsitute 2j-20 for r in second equation

    2j-20+j=85

    add like terms

    3j-20=85

    add 20 to both sides

    3j=105

    divide both sides by 3

    j=35

    subsitute

    r+j=85

    r+35=85

    subtract 35 from both sides

    r=50

    r=50

    j=35
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