Х+1/ 3 + у+2/ 4 = -1/3
х+3/ 5 + у-1/ 2 = -0,9
4(х+1)+ 3(у+2)/ 12 = -1/3
2(х+3)+ 5(у-1)/ 10 = -0,9
4х+4+ 3у+6/ 12 = -1/3
2х+6+ 5у-5/ 10 = -0,9
4х+3у+10 = 12*(-1/3)
2х+5у+1 = 10* (-0,9)
4х+3у= -4 -10
2х+5у= -9-1
4х+3у= -14
2х+5у= -10 |*(-2)
-4х-10у=20
сложим уравнения
4х-4х+3у-10у=-14+20
-7у=6
у=-6/7
2х+5у= -10
2х=-10-5у
2х=-5(2+у)
х=-5(2+у)/2
х=-5(2-6/7)/2=
-5*(1 1/7) / 2=
-5 * 8/7 /2=
-5*8 / 7 * 1/2=
-5*4/7= -20/7 = - 2 6/7
Ответ: х=-6/7; у=- 2 6/7