Answer Happy

3D equations of a line, please finish all questions,
1-10. thank you very much
1. Write down the co-ordinates of a point (X1, 91, 21), where x1 = y1 # 21 +0. Label it A (4) 2. Write down the co-ordinates of a different point (X2, Y2,22), where x2 + y2 + Z2 = 0. Label it B. (3 3. Calculate AB. 13 4. Find the equation of the line (L1) going through A and B. 5. Find the equation of a perpendicular line (L2) going through A. 6. Find the equation of a perpendicular line (L3) going through B. 7. C is a point on L2 such that |AB| = |AC|. 8. D is a point on L3 such that |AB| = |BDI. 9. Calculate CD. 10. Find the equation of the line (L4) going through C and D.