brate- k1*k2= -1,lea y1=x+1, y=-x+1,pb k1xk2=-1,k1*k2 blir -1,k1*k2=-1,eb -1 = k1*k2,k1*k2 ? -1,j.r: -k1/(k1^2)=k2,ak: k1*k2=-1,-1 = k1*k2,e.s o i.a = -1=k1*k2,j.r: k1/(-k1^2)=k2,brate: k1*k2= -1,