1. Which of these situations occum in R3 but not in R2? a. parallel lines c. coincident lines h. skew lines d. intersecting lines 2. At what point does the line L: r = [2,3, l) +S[2,3,l), s E R intersect they-axis? a. (2,3,1) c. (0,0,0) 0. (2,9,1) cl. (0,6,0) 3. Which of the following is not a linear equation? a. %x+y=4 c. 4(x+y)=l3 s. x(20+y)=40 cl. x=24-5y