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24 May, 14:08

X+7=2y+1

3x-y=7

solve for x and y

+1
Answers (1)
  1. 24 May, 14:09
    0
    {x+7=2y+1 ⇔ x-2y=1-7 ⇔ x-2y=-6

    {3x-y=7 / * (-2)

    {x-2y=-6

    {-6x+2y=-14 (+)

    x-6x-2y+2y=-6-14

    -5x=-20 / : (-5)

    x=4

    x - 2y=-6

    4-2y=-6 / - 4

    -2y=-10 / : (-2)

    y=5

    Solution: (4; 5)
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