1. The problem statement, all variables and given/known data Find an equation of the plane that contains these lines: r=<1,1,0>+t<1,-1,2> r=<2,0,2>+s<-1,1,0> 2. Relevant equations 3. The attempt at a solution I took the cross product of <1,-1,2> and <-1,1,0> to get <-2,-2,0>. I used the point (1,1,0) to get the equation of the plane: -2(x-1)-2(y-1)=0 But the correct answer is supposed to be x+y=2. I'd really appreciate it if someone could show me what I'm doing wrong. Thanks!