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28 October, 18:02

Solve using elimination method

7x+15y=32

X-3y=20

+2
Answers (2)
  1. 28 October, 19:16
    0
    {7x+15y=32

    {x-3y=20 / * 5

    {7x+15y=32

    { 5x-15y=100 (+)

    7x+5x+15y-15y=32+100

    12x=132 / : 12

    x=11

    x-3y=20

    11-3y=20 / - 11

    -3y = 9 / : (-3)

    y=-3

    The solution: (11; - 3)
  2. 28 October, 19:39
    0
    1. 7x+15y=32

    2. x-3y=20/*5

    2. 5x-15y=100

    1.+2. = >12x=132

    x=11

    1. 7*11+15y=32

    15y = - 45

    y = - 3

    x=11; y=-3
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