1) [latex] \left \{ {{4x-y=20} \atop {4x+y=12}} \right. [/latex] 2) [latex] \left \{ {{9x+17y=52} \atop {26x-17y=18}} \right. [/latex] 3) [latex] \left \{ {{-5x+7y=2} \atop {8x+7y=15}} \right. [/latex] 4) [latex] \left \{ {{9x-...

Question

1) [latex] \left \{ {{4x-y=20} \atop {4x+y=12}} \right. [/latex] 2) [latex] \left \{ {{9x+17y=52} \atop {26x-17y=18}} \right. [/latex] 3) [latex] \left \{ {{-5x+7y=2} \atop {8x+7y=15}} \right. [/latex] 4) [latex] \left \{ {{9x-...

1) [latex] \left \{ {{4x-y=20} \atop {4x+y=12}} \right. [/latex] 2) [latex] \left \{ {{9x+17y=52} \atop {26x-17y=18}} \right. [/latex] 3) [latex] \left \{ {{-5x+7y=2} \atop {8x+7y=15}} \right. [/latex] 4) [latex] \left \{ {{9x-6y=24} \atop {9x+8y=10}} \right. [/latex]

Гость

Ответ(ы) на вопрос:

Accepted Answer

не учись я помогу) 1) 4х-у=20 16-у=20 -у=20-16 -у=4 у=1 ответ(4;-1) 2)9х+17у=52 26х-17у=18 9*2+17у=52 18+17у=56 17у=52-18 17у=34 у=2 ответ(2;2) 3) -5х+7у=2 8х+7у=15 -13х=-13 х=1 -5*1+7у=2 -5+7у=2 7у=2+5 7у=7 у=1 ответ(1:1) 4)9х-6у=24 9х+8у=10 -14у=14 у=-1 9х-6*(-1)=24 9х+6=24 9х=18 х=2 ответ (2;-1)