rozwiąz metodą podstawiania: 2x+3y=-7 3x+y=0 uklady rownan

3x+y=0 2x+3y=-7 y=-3x 2x+3•(-3x)=-7 y=-3x 2x-9x=-7 y=-3x -7x=-7 |:(-7) y=-3x x=1 y=-3•1 x=1 y=-3 x=1

[latex] left { {{2x+3y=-7} atop {3x+y=0}} ight. \ left { {{2x+3y=-7} atop {y=-3x}} ight. \ left { {{2x+3*(-3x)=-7} atop {y=-3x}} ight. \ left { {{2x-9x=-7} atop {y=-3x}} ight. \ left { {{-7x=-7} atop {y=-3x}} ight. \ left { {{x=1} atop {y=-3*1}} ight. \ left { {{x=1} atop {y=-3}} ight. [/latex]