Question

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Answer 1

Ответ: 1. u=4, y=1

2. x=1, y=3

3. x=1, y=2

Объяснение:

1. $\left \{ {{u-3y=1} \atop {2u+y=9}} \right. \left \{ {{u-3(9-2u)=1} \atop {y=9-2u}} \right. \left \{ {{u-27+6u=1} \atop {y=9-2u}} \right. \left \{ {{7u=28} \atop {y=9-2u}} \right. \left \{ {{u=4} \atop {y=9-2*4}} \right. \left \{ {{u=4} \atop {y=1}} \right.$

2. $\left \{ {{x+y=4} \atop {4x-y=1}} \right. \left \{ {{x=4-y} \atop {4(4-y)-y=1}} \right. \left \{ {{x=4-y} \atop {16-4y-y=1}} \right. \left \{ {{x=4-y} \atop {-5y=-15}} \right. \left \{ {{x=4-3} \atop {y=3}} \right. \left \{ {{x=1} \atop {y=3}} \right.$

3. $\left \{ {{3x+4y=11} \atop {5x-2y=1}} \right. \left \{ {{3x+2(5x-1)=11} \atop {2y=5x-1}} \right. \left \{ {{3x+10x-2=11} \atop {2y=5x-1}} \right. \left \{ {{13x=13} \atop {2y=5x-1}} \right. \left \{ {{x=1} \atop {2y=5*1-1}} \right. \left \{ {{x=1} \atop {2y=4}} \right. \left \{ {{x=1} \atop {y=2}} \right.$