1.{10x-2y=-2 {-5x+y=1 2.{3x-y=4 {2x+y=6 3.{x-2y=4 {2x-3y=1 giai he pt.e dg can gap .mn lm giup e vs

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1. 1.$\left \{ {{10x-2y=-2} \atop {-5x+y=1}} \right.$

   ⇔$\left \{ {{10x-2y=-2} \atop {10x-2y=-2}} \right.$

   ⇔Vô số nghiệm

   2.$\left \{ {{3x-y=4} \atop {2x+y=6}} \right.$

   ⇔$\left \{ {{-3x+y=-4} \atop {2x+y=6}} \right.$

   ⇔$\left \{ {{-5x=-10} \atop {2x+y=6}} \right.$

   ⇔$\left \{ {{x=2} \atop {2x+y=6}} \right.$

   ⇔$\left \{ {{x=2} \atop {2.2+y=6}} \right.$

   ⇔$\left \{ {{x=2} \atop {4+y=6}} \right.$

   ⇔$\left \{ {{x=2} \atop {y=2}} \right.$

   3.$\left \{ {{x-2y=4} \atop {2x-3y=1}} \right.$

   ⇔$\left \{ {{2x-4y=8} \atop {2x-3y=1}} \right.$

   ⇔$\left \{ {{-y=7} \atop {2x-3y=1}} \right.$

   ⇔$\left \{ {{y=-7} \atop {2x-3y=1}} \right.$

   ⇔$\left \{ {{y=-7} \atop {2x-3.(-7)=1}} \right.$

   ⇔$\left \{ {{y=-7} \atop {2x+21=1}} \right.$

   ⇔$\left \{ {{y=-7} \atop {2x=-20}} \right.$

   ⇔$\left \{ {{y=-7} \atop {x=-10}} \right.$

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