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11 September, 21:58

X - Y = 11

2x + Y = 19

where do the lines cross

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Answers (1)
  1. 11 September, 22:12
    0
    Just solve the equations:

    A) X - Y = 11

    B) 2x + Y = 19

    Multiply A) by - 2

    A) - 2X + 2Y = - 22 then add to B)

    B) 2x + Y = 19

    3Y = - 3

    Y=-1

    A) X - - 1 = 11

    x = 10
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