1) y^2-8x=-16,
y-2x=-12
y^2-8x=-16,
y=-12+2x
(-12+2x)^2-8x+16=0,
y=-12+2x
144-48x+4x^2-8x+16=0,
y=-12+2x
4x^2-56x+160=0,(1)
y=-12+2x
(1) 4x^2-56x+160=0| ÷4
x^2-14x+40=0
A=1, k=-7, c=40
D=k^2-ac
D=49-40=9
X1= 7-3=4
X2 = 7+3=10
X=4
Y=-4
X=10
Y=8
2) y+x-2=0,
X^2-3xy=4
Y=-x+2,
X^2-3x (-x+2)-4=0
Y=-x+2,
X^2+3x^2-6x-4=0
Y=-x+2,
4x^2-6x-4=0(1)
(1) 4x^2-6x-4=0| ÷2
2x^2-3x-2=0
A=2, b=-3, c=-2
D=b^2-4ac
D= 9+16=25
X1= (3+5)÷2=4
X2= (3-5)÷2= -1
X=4
Y=-2
X=-1
Y=3