Ответы и объяснения

2013-05-17T12:41:13+04:00
2013-05-17T16:03:13+04:00

x+2y=11
5x-3y=3

 

x+2y=11

y=-x/2+5.5

 

5x-3y=3

5x-3*(-x/2+5.5)=3

5x+1.5x-16.5-3=0

6.5x-19.5=0

x=19.5/6.5

x=3

 

x+2y=11

3+2y=11

-8+2y=0

y=8/2

y=4