Question 20 pls

through the given In Exercises 19-22, determine by inspection whether the the graph of the eq given system has nontrivial solutions or only the trivial 26. The line through solution. 27. The line through 19. 2x1 + 3x2 - x3 = 0 28. The conic throu X1 - X2+ 213 = 0 and (4, 0). 20. X1 + 2x2 - x3 + 2x4 =0 29. The conic thro 2x1+ x2+ x3 - $4=0 and (7, -1). 3x1 - x2 - 2x3 + 3x4 = 0 30. The quadric sur 21. x1 + 2x2 - x3 = 0 (0, 1, 0), (3, 1, x2 + 2x3 = 0 (2, 2, 3), (2, 2, 1 4x3 = 0 31. The quadric sur 22. X1 - X2 = 0 (6, 0, 6), (3, 1, 3x1 =0 (3, 1, 4), (0, 0, 2)