{3x+y=2
{y^2-x^2=12
{y=2-3x
{(2-3x)^2-x^2=12
4-12x+8x^2=12
8x^2-12x-8=0
D=144+4*8*8=20^2
x1=(12+20)/16=2
x2=(12-20)/16=-1/2
y1=2-6=-4
y2=2+3/2=7/2
ответ (2,-4) U (-1/2,7/2)
{3x+y=2
{y^2-x^2=12
{y=2-3x
{(2-3x)^2-x^2=12
4-12x+8x^2=12
8x^2-12x-8=0
D=144+4*8*8=20^2
x1=(12+20)/16=2
x2=(12-20)/16=-1/2
y1=2-6=-4
y2=2+3/2=7/2
ответ (2,-4) U (-1/2,7/2)