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8 June, 09:29

Solve each system by elimination

-9x - 4y=2

7x + 4y = - 6

+3
Answers (1)
  1. 8 June, 13:15
    0
    cộng vế theo vế ta đc:

    -2x=-4x=2

    thay x=2 vào 1 trong 2 ptrình ta đc: y=-5
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