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{-x - y = -6
{-x+y = 2
{-x= -6+y
{-x+y= 2
{x=6-y
{-(6-y)+y=2
{x=6-y
{-6+y+y=2
{x=6-y
{2y=2+6
{x=6-y
{2y=8/:2
{x=6-y
{y=4
{x=6-4
{y=4
{x=2
{y=4
b)
{4x - 5y = -4
{-2x+3y = 1,1/:(-2)
{4x-5y= -4
{x-1,5y= -0,55
{4x-5y= -4
{x= -0,55+1,5y
{4(-0,55+1,5y)-5y= -4
{x= -0,55+1,5y
{-2,2-6y-5y= -4
{x= -0,55+1,5y
{-11y= -4+2,2
{x= -0,55+1,5y
{-11y= -1,8/:(-11)
{x= -0,55+1,5y
{y=18/10 *1/11
{x= -0,55+1,5y
{y=18/110
{x= -0,55+1,5y
{y=9/55
{x=-0,55+1,5*9/55
{y=9/55
{x= -0,55+15/10*9/55
{y=9/55
{x=-0,55+27/110
{y=9/55
{x=-55/100+27/110
{y=9/55
{x=-605/1100+270/1100
{y=9/55
{x= -335/1100
{y=9/55
{x= -67/220