I.x2+9x+14=0
II.y2+y−2=0
if x < y
if x y
if x = y
if x > y
x2+9x+14=0⇒(x+2)(x+7)=0⇒x=−2,−7y2+y−2=0⇒(y+2)(y−1)=0⇒y=1,−2∴x≤y
I.x2+x−20=0 II.y2−y−30=0
I. x2+ 9x + 14 = 0
II. y2 + y - 2 = 0
I.9x2−18+5=0
II.2y−9y+10=0