solve the 2nd equation for y, get y=2x+(7/2)
then plug that into the 1st equation for y and get 2x^2 - 4x + (2x +(7/2)) =3
Combine like terms on the left and subtract 3 from both sides to get
2x^2 - 2x +1/2 = 0, if you don't like working with fractions you can multiply it all by 2 and get 4x^2 - 4x +1 =0
then factor into (2x-1)(2x-1)=0, set 2x-1=0 and solve to get x=1/2, plug x=1/2 into either equation to get y= 4 1/2
solution set is (1/2, 4 1/2)