Question

розвяжіть систему рівнянь 2(х+3)=7y-5 и под этим 6(х-3)-5(y+1)= -24

Answer 1

2(x+3)=7y-5
6(x-3)-5(y+1)=-24

2x-7y=-11/(-3)
6x-5y=-1

-6x+21y=33
6x -5y=-1   /+
16y= 32,y=2

2x-7.2=-11, 2x-14=-11,2x=14-11,2x=3, x=1,5
 x=1,5 , y=2
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Answer 2

$left{{{2(x+3)=7y-5}atop{6(x-3)-5(y+1)=-24}}right.left{{{2x+6=7y-5}atop{6x-18-5y-5=-24}}right.left{{{2x-7y=-5-6}atop{6x-5y=-24+23}}right.left{{{2x-7y=-11}atop{6x-5y=-1}}right.\left{{{2x-7y=-11/-3}atop{6x-5y=-1}}right.left{{{-6x+21y=33}atop{6x-5y=-1}}right.\-6x+21y+6x-5y=33-1\16y=32\y=2\----\6(x-3)-5(y+1)=-24\6x-18-5(2+1)=-24\6x-18-15=-24\6x=-24+33=9\x=frac{9}{6}=1,5$
Ответ: 1,5; 2.