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anonymous

  • 5 years ago

the sum of two numbers is 70. one number is 8 more than the other.whats the smaller number?

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  1. anonymous
    • 5 years ago
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    hi drizzy

  2. anonymous
    • 5 years ago
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    this is a question with two unknowns , and so you need two equations to solve it

  3. anonymous
    • 5 years ago
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    that's the tricky part in general - figuring out the two equations from a word problem

  4. anonymous
    • 5 years ago
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    so here are the equations I get: x+y = 70 x = 7y

  5. anonymous
    • 5 years ago
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    sorry x=8y for the second

  6. anonymous
    • 5 years ago
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    the next step is to substitute the value for a variable in one equation into the other

  7. anonymous
    • 5 years ago
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    this is what I get, Isnt is x for first number, x+8 for second number, then x + (x+8) = 70, 2x +8 = 70 2x=62, x= 31

  8. anonymous
    • 5 years ago
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    31 + (31+8) = 31 + 39 = 70

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spraguer (Moderator)
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