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22 July, 05:00

Lily and Rosie are sister the sum of their ages is 19 and the positive difference of their ages 9 set up a system of equations involving Lindsay's age, L, and roses age, R, assuming the lily is the older child solve the system to find their ages

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  1. 22 July, 05:20
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    L+R=19

    L-R=9

    2L=28

    L=14

    (14) + R=19

    R=5

    L=14

    R=5

    Check:

    (14) + (5) = 19

    (14) - (5) = 9
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