а) 2x-11+y=0 2x+y-11=0 (*5) 10x+5y-55=0 -13y-39=0 5x-4y-8=0 5x-4y-8=0 (*2) 10x-8y-16=0 -13y=39 (*(-1)) y= -3 2x-11-3=0 2x-14=0 2x=14 x=7б) 2y-x-3=0 2y-x-3=0 -11x+5=0 y+5x-4=0 (*2) 2y+10x-8=0 x= -2,2 2y-2,2=3 2y=3+2,2 y=2,6в) 3x-y-5=0 (*2) 6x-2y-10=0 11x-33=0 5x+2y=23 5x+2y-23=0 x=3 9-y-5=0 y-5=0 y=5 г) x-2y-6=0 (*3) 3x-6y-18=0 -11y-11=0 3x+5y-7=0 3x+5y-7=0 y= -1 x+2-6=0 x-4=0 x=4