Решите систему уравнений A) y=3x-7 y=7-x Б)2y+x=7 15y-2x=27...

kami5467 @kami5467

July 2022 1 2 Report

Решите систему уравнений
A) y=3x-7
y=7-x
Б)2y+x=7
15y-2x=27

Answers & Comments

wasjafeldman

Verified answer

$A$

$\left \{ {{y=3x-7} \atop {y=7-x}} \right. 

7-x=3x-7

-x-3x=-7-7

-4x=-14

x= 3.5

y=3*3.5-7

y=10.5-7

y=3.5$

$B$

$\left \{ {{2y+x=7} \atop {15y-2x=27}} \right. 

 \left \{ {{x=7-2y} \atop {15y-2x=27}} \right. 

 15y-2(7-2y)=27

15y-14+4y=27

15+4y=27+14

19y=41

y= 41/19

x=7- 2*(41/19)= 7-(82/19)= (133/19)-(82/19)=51/19$

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