Решите систему ПОЖАЛУЙСТА!!!!!! 5x-13y=30 15x-5y=30. Created by juniechannel33. algebra-ru

Решите систему ПОЖАЛУЙСТА!!!!!! 5x-13y=30 15x-5y=30...

August 2022 1 3 Report

Решите систему ПОЖАЛУЙСТА!!!!!!
5x-13y=30
15x-5y=30

Answers & Comments

xtoto $\left \{ {{5x-13y=30
} \atop {15x-5y=30}} \right. ;
 \left \{ {{-3*(5x-13y)=-3*30
} \atop {15x-5y=30}} \right. ;
 \left \{ {{-15x+39y=-90
} \atop {15x-5y=30}} \right. ;$

$\left \{ {{-15x+39y+(15x-5y)=-90+(30)
} \atop {5*(3x-y)=5*6}} \right. ;
 \left \{ {{-15x+39y+15x-5y=-90+30
} \atop {3x-y=6}} \right. ;$

$\left \{ {{34y=-60} \atop {3x=y+6}} \right. ; 
 \left \{ {{17y=-30} \atop {x=\frac{y+6}{3}}} \right. ;
 \left \{ {{y=-\frac{30}{17}} \atop {x=\frac{y}{3}+ \frac{6}{3} }} \right. ; 
 \left \{ {{y=-\frac{30}{17}} \atop {x=-\frac{30}{3*17}+ 2}} \right. ;$

$\left \{ {{x=- \frac{10}{17}+ \frac{34}{17} } \atop {y=-\frac{30}{17} }} \right. ;
 \left \{ {{x=\frac{24}{17} } \atop {y=-\frac{30}{17} }} \right. .$

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Answers & Comments

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