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14 December, 00:59

7x - 3y = 20

y = 5 х - 4

x=

y=

+4
Answers (1)
  1. 14 December, 01:20
    0
    x = - 1

    y = - 9

    Step-by-step explanation:

    7x - 3y = 20

    7x - 3 (5 х - 4) = 20

    7x - 15x + 12 = 20

    -8x = 20 - 12

    x = 8/-8

    x = - 1

    7x - 3y = 20

    7 (-1) - 3y = 20

    -7 - 3y = 20

    -3y = 20 + 7

    -3y = 27

    y = 27/-3

    y = - 9
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