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26 November, 14:10

2x-y=7

Y=0.5x+17

0.2x+y=-1.8

Y-5x=6

4x-5y=14

-4x+4=-6

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Answers (1)
  1. 26 November, 15:08
    0
    1.

    2x-y=7

    y=0.5x+17

    y=-7+2x

    0,5x+17=2x-7

    -1,5x=-24

    x=16

    2.

    0.2x+y=-1.8

    Y-5x=6

    y=6+5x

    0.2x+y=-1.8

    0,2x+6+5x=-1,8

    5,2x=-7,8 / : (5,2)

    x=1,5

    3.

    4x-5y=14} +

    -4x+4[y]=-6

    4x-5y - 4x+4y=14+6

    -y=20

    y=-20

    4x-5y=14

    4x = 14 + 5 (-1)

    4x=9

    x=2,25
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