Question

ДАЮ 50 БАЛЛОВ ДАЙТЕ НА ВСЁ ОТВЕТ ПОЖАЛУЙСТА (файл прикреплён)

Answer 1

Ответ:

Объяснение:

$1) \left \{ {{4x-2y=2} \atop {2x+y=5}} \right. ; \left \{ {{4x-2(5-2x)=2} \atop {y=5-2x}} \right. ;\left \{ {{4x-10+4x=2} \atop {y=5-2x}} \right. ;\\\left \{ {{8x=12} \atop {y=5-2x}} \right. ;\left \{ {{x=\frac{12}{8} } \atop {y=5-2x}} \right. ;\left \{ {{x=\frac{3}{2} } \atop {y=5-2x}} \right. ; \left \{ {{x=1,5} \atop {y=5-3}} \right. ;\\\left \{ {{x=1,5} \atop {y=2}} \right. ; \\x+y=1,5+2; \\x+y=3,5.$

$2) \left \{ {{5x-y=7} \atop {3x+2y=-1}} \right. ; \left \{ {{y=5x-7} \atop {3x+2(5x-7)=-1}} \right. ; \left \{ {{y=5x-7} \atop {3x+10x-14=-1}} \right. ;\\\left \{ {{y=5x-7} \atop {13x=13}} \right. ;\left \{ {{y=5-7} \atop {x=1}} \right. \left \{ {{y=-2} \atop {x=2}} \right. ;\\x+y=2+(-2);\\x+y=2-2;\\x+y=0.$

$3)\left \{ {{2x-y=1} \atop {3x+2y=12}} \right.; \left \{ {{y=2x-1} \atop {3x+2(2x-1)=12}} \right. ;\left \{ {{y=2x-1} \atop {3x+4x-2=12}} \right. ;\\\left \{ {{y=2x-1} \atop {7x=14}} \right. ;\left \{ {{y=4-1} \atop {x=2}} \right.; \left \{ {{y=3} \atop {x=2}} \right. ;\\x+y=2+3;\\x+y=5.$

$4) \left \{ {{3x-y=-1} \atop {-x+2y=7}} \right. ;\left \{ {{y=3x+1} \atop {-x+2(3x+1)=7}} \right. ;\left \{ {{y=3x+1} \atop {-x+6x+2=7}} \right. ;\\\left \{ {{y=3x+1} \atop {5x=5}} \right. ;\left \{ {{y=3+1} \atop {x=1}} \right. ;\left \{ {{y=4} \atop {x=1}} \right. ;\\x+y=1+4;\\x+y=5.$

$5)\left \{ {{3x+2y=8} \atop {4x-y=7}} \right. ;\left \{ {{3x+2(4x-7)=8} \atop {y=4x-7}} \right. ;\left \{ {{3x+8x-14=8} \atop {y=4x-7}} \right. ;\\\left \{ {{11x=22} \atop {y=4x-7}} \right. ;\left \{ {{x=2} \atop {y=8-7}} \right. ;\left \{ {{x=2} \atop {y=1}} \right. ;\\x+y=2+1;\\x+y=3.$