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17 December, 20:57

Solve the system of equations. y = 9x y = 2x + 63

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Answers (2)
  1. 17 December, 21:16
    0
    y=2x+7

    y=9x+8

    From (1),

    x = (y-7) / 2

    Substituting value of x in eqn (2) we get,

    y = 9. (y-7) / 2 + 8
  2. 17 December, 21:18
    0
    Y=9x and

    y=2x+63

    subsitute 9x for y

    9x=2x+63

    minus 2x from both sides

    9x-2x=2x-2x+63

    7x+0=63

    7x=63

    divide both sides by 7

    7x/7=63/7

    (7/7) x=9

    (1) x=9

    x=9

    sub back to find y

    y=9x

    y=9 (9)

    y=81

    (x, y)

    (9,81)

    the solution is (9,81)
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