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math

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mary is x years old. it is her birthday today. her sister, sherry is 4 years older than she is. after 7 years their combined age will be 24 years write a liner=ar equation for their combined age after 7 years

  • math -

    mary is now --- x
    sherry is now --- x+4

    7 years from now:
    mary --- x+7
    sherry --- x=4 + 7 = x+11

    x+7 + x+11 = 24

    I will let you solve it

  • math -

    x=4

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