1. Answer true or false for each of the following questions and give justification for your response. You must give justification to receive any credit. Justification should include mathematical justification or example(s) illustrating your response. (a) The line with symmetric equations I-2 y+2 2- 4 intersects r - axis at 6 2 (-2, 0,0) (b) All lines contained in a given plane ar + by + cz + d = 0 are orthogonal to the vector ni = (a, b, c) .