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24 May, 22:39

Solve using elimination.

-7x - 5y = 5

-9x - 5y = 15

+4
Answers (2)
  1. 24 May, 22:48
    0
    -7x-5y=5

    - (-9x-5y) = 15 It's minus because negative times negative = positive

    2x=-10

    x = - 5

    -7 (-5) - 5y = 5

    35-5y = 5

    -5y = - 30

    y=6
  2. 24 May, 23:20
    0
    Eliminate y's

    multiply 2nd eqution by - 1 and add to 2nd

    -7x-5y=5

    9x+5y=-15 +

    2x+0y=-10

    2x=-10

    divide 2

    x=-5

    sub back

    -9x-5y=15

    -9 (-5) - 5y=15

    45-5y=15

    minus 45 bot sides

    -5y=-30

    divide both sides by - 5

    y=6

    x=-5

    y=6

    (x, y)

    (-5,6)
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