3у-х=7
у²+3х=1
x=3y-7
y²+3x=1
y²+3(3y-7)=1
y²+9y-21=1
y²+9y-22=0
y²+2y-11y-22=0
y(y+2)-11(y+2)=0
(y-11)(y+2)=0
y=11 ∨ y=-2
x=3*11-7 ∨ x=3*(-2)-7
x=26 ∨ x=-13
<u>(26,11),(-13,-2)</u>