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12 April, 23:04

Solve using linear combination

x-y=-7

x+y=7

A. (-7,0)

B. (7,0)

C. (0,7)

D. (0,-7)

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Answers (1)
  1. 12 April, 23:25
    0
    Add them equationas and y's cancel

    x-y=-7

    x+y=7 +

    2x+0y=0

    2x=0

    x=0

    so

    0+y=7

    y=7

    (x, y)

    x=0, y=7

    (0,7)

    C
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