Question

РЕШИТЬ СИСТЕМУ УРАНЕНИЙ:
а) у=х-1
х+3у=9
б) х-3у=8
2х-3у=10

Answer 1

$a) left {{{y=x-1} atop {x+3(x-1)=9}} right. left { {{y=x-1} atop {4x-3=9}} right. left { {{y=x-1} atop {4x=12}} right. left { {{y=x-1} atop {x=3}} right. left { {{y=-1} atop {x=3}} right.$
$b) left { {{2(3y+8)-3y=10} atop {x=3y+8}} right. left { {{6y-3y+16=10} atop {x=3y+8}} right. left { {{3y=-6} atop {x=3y+8}} right. left { {{y=-2} atop {x=2}} right.$

Answer 2

а под а

Answer 3

y=x-1, x+3(x-1)=9 , х=3, у=-1

Answer 4

СПС

Answer 5

у=-1?

Answer 6

а не 2