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22 January, 00:53

Solve algebraically: lara bought 2 pencils and a eraser for $1.50. if a pencil costs 30 cents more than an eraser, how much does a pencil cost?

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Answers (2)
  1. 22 January, 01:14
    0
    2p+e=1.50

    p=0.30+e

    to make it easier

    minus 0.30

    p-0.30=e

    sub p-30 for e

    2p+p-0.30=1.50

    3p-0.30=1.50

    add 0.30 to both sides

    3p=1.80

    divide both sides by 3

    p=0.60

    a pencil costs 60 cents
  2. 22 January, 01:31
    0
    Change $1.50 to 150 cents

    150 = 2 (x+30) + x

    150 = 2x + 60 + x

    150-60 = 2x + x

    90 = 3x

    90/3=x

    x = 30

    30+30 = 60

    One pencil cost 60 cents
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