ПЛИИИИИЗЗ!!ПРОШУУ Фото в приложении)Выполнить методом сложения. Created by vipkamillochka. matematika-ru

ПЛИИИИИЗЗ!!ПРОШУУ Фото в приложении)Выполнить методом сложения...

miron2077

Verified answer

5х+у=20
2х-у=1
сложим
7х=21
х=3
у=2*3-1=5

2х+3у=2
-2х+5у=-18
сложим
8у=-16
у=-2
х=(2-2*(-2)):2=3

2х-3у=9
4х+3у=27
сложим
6х=36
х=6
у=(27-4*6):3=1

х+4у=39
2х-у=15
домножим первое на -2
-2х-8у=-78
2х-у=15
сложим
-9у=-63
у=7
х=(15+7):2=11

2 votes Thanks 1

DimaPuchkov $\left \{ {{x+4y=39} \atop {2x-y=15}} \right. \left \{ {{x=39-4y} \atop {78-8y-y=15}} \right. \left \{ {x=39-4y} \atop {-9y=-63}} \right. \left \{ {{x=39-28} \atop {y=7}} \right. \left \{ {{x=11} \atop {y=7}} \right.$ $\left \{ {{5x+y=20} \atop {2x-y=1}} \right \left \{ {{y=20-5x} \atop {2x-20+5x=1}} \right. \left \{ {{y=20-5x} \atop {7x=21}} \right. \left \{ {{y=20-15} \atop {x=3}} \right. \left \{ {{y=5} \atop {x=3}} \right.$

$\left \{ {{2x+3y=2} \atop {-2x+5y=-18\right. \left \{ {{2x=2-3y} \atop {-2+3y+5y=-18}} \right. \left \{ {{2x=2-3y} \atop {8y=-16}} \right. \left \{ {{x= \frac{2+6}{2}} \atop {y=-2}} \right. \left \{ {{x=4} \atop {y=-2}} \right.$

$\left \{ {{2x-3y=9} \atop {4x+3y=27}} \right. \left \{ {{2x-3y=9} \atop {3y=27-4x}} \right. \left \{ {{2x-27+4x=9} \atop {3y=27-4x}} \right. \left \{ {{6x=36} \atop {3y=27-4x}} \right. \left \{ {{x=6} \atop {y= \frac{27-24}{3} }} \right. \left \{ {{x=6} \atop {y=1}} \right.$

$\left \{ {{x+4y=39} \atop {2x-y=15}} \right. \left \{ {{x=39-4y} \atop {78-8y-y=15}} \right. \left \{ {{x=39-4y} \atop {-9y=-63}} \right. \left \{ {{x=39-28} \atop {y=7}} \right. \left \{ {{x=11} \atop {y=7}} \right.$

3 votes Thanks 1

Answers & Comments

Verified answer

postrojte grafik uravnenie 34 h

lyudi budte chutochku dobreepomogite izobrazite zadannye promezhutkinakoo

izobrazite zadannye promezhutkinakoordinatnoj pryamojinajdite promezhutok yavlyayu

3h 2h4 reshite i raspishite pliiizzzbudte dobree

4drob 1 pozhajlusta

postrojte grafik linejnoj funkcii u4h 2 s pomoshyu grafika opredelite sleduyushee

3h 10 9h22h pomogite plizvse reshila etot nemogu

3h 12h 2 reshite uravneniepomogite pliiizpliiizzz

napishite nebolshoj stih na temu grust pliz

pliiiiizzbudte lyudmi pomogite

рекомендуемые вопросы

Helpful Links

Helpful Social