{x=2y+1
{3x-2y=17

{x=3y-1
{3x+2y=8

{x=3y-6
{x-4y=-10

{x=2y+5
{x-6y=21

решите способом сложения :)

х=2у+13х-2у=17х-2у=1          ( *-1)3х-2у=17-х+2у= -13х-2у=172х=16х=8х=82у=х-1х=82у=7х=8у=3,5(8; 3,5).х=3у-13х+2у=8х-3у= -1         ( *-3)3х+2у=8-3х+9у=33х+2у=811у=11х=3у-1у=1х=3-1у=1х=2(2; 1).х=3у-6х-4у= -10х-3у= -6         ( *-1)х-4у= - 10-х+3у=6х-4у= -10-у= -4х=3у-6у=4х=4*3-6у=4х=6(6; 4).х=2у+5х-6у=21х-2у=5         ( * -1)х-6у=21-х+2у= -5х-6у=21-4у=16х=2у+5у= -4х=-2*4+5у= -4х= -3(-3; -4)