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9 January, 19:11

1. solve each system by substitution. 7x+4y=-21

3x+y=-4

2.

-8x+7y=-6

y=6

+2
Answers (1)
  1. 9 January, 19:13
    0
    1. y = - 4 - 3x

    7x + 4 (-4 - 3x) = - 21

    7x - 16 - 12x = - 21

    -5x = - 5

    x = 1

    y = - 4 - 3 = - 7

    2. y = 6

    -8x + 42 = - 6

    48 = 8x

    x = 6
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