solve those problem

2. Let u and v be as above. On the x-y graph, draw the following: u, v, u v, u + v, and 21: + v . 7. For what value(s) of h is the vector -6 in the span of the vectors | 3 and [_?] 8. Write the following system of equations as a vector equation, and then as a matrix equation. Don't bother solving. 4x - 2y - z = 8 x - y - 4z = 12 x + 2y + 5z = 119. Let A = 2 71 - 3- and> - [;]. Write the augmented matrix for the linear system that corresponds to the matrix equation Ax = b . Then solve the system, and write the solution as a vector. 10. Let A = > _ and b = 1 . Show that the equation Ax = b does not have a solution for all possible b, and describe the set of all b for which Ax = b does have a solution (bi and b2 must satisfy some equation - what is the equation?)