27jkindrew 27jkindrew
  • 16-11-2022
  • Mathematics
contestada

16) 5x +3y=13 and 3x+5y=-25
17) -9y=-3x+18 and 2x-6y=30
18) x-y=5 and x+y=-10
19) y=-3 and x=-6
20) x=-4 and x=9

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