A first number plus twice a second number is 10. Twice the first number plus the second totals 29. F

Discussion in 'Calculator Requests' started by math_celebrity, Nov 18, 2018.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    A first number plus twice a second number is 10. Twice the first number plus the second totals 29. Find the numbers.

    Let the first number be x. Let the second number be y. We are given the following two equations:
    1. x + 2y = 10
    2. 2x + y = 29
    We can solve this 3 ways using:
    1. Substitution
    2. Elimination
    3. Cramers Rule
    Using any of the 3 methods, we get the same answers of (x, y) = (16, -3)
     

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