Question

Решите СИСТЕМУ УРАВНЕНИЙ
1) 2х+5у=1-х+2у
14х-5=9х-3у-2

(1/2 (одна вторая) х)
2) 1/2 х+3у=1,5
0,5х-2у=4

Answer 1

1)
$left { {{2x+5y=1-x+2y} atop {14x-5=9x-3y-2}} right. \ left { {{2x+x=-5y+1+2y} atop {14x-9x=5-3y-2}} right. \ left { {{3x+3y=1} atop {5x+3y=3}} right. \ left { {{-3x-3y=-1} atop {5x+3y=3}} right. \ left { {{x=1} atop {y=- frac{2}{3} }} right. \ 2) \ 0,5= frac{1}{2} \ left { {{0,5x+3y=1,5} atop {0,5x-2y=4}} right. \ left { {{-0,5x-3y=-1,5} atop {0,5x-2y=4}} right. \ left { {{y=-0,5} atop {x=6}} right.$