A couple questions:

1)Consider the transformation T fromR^2 toR^3 given by T [x1, x2] = x1[1, 2, 3] + x2[4, 5, 6]. Is this transformation linear? If so, find its matrix. Note: these matrices are vertical, I just didn't know how to type them vertically.

2)Find ann x mmatrixAsuch thatAx= 3x, for allxinR^n. Note: x is a vector, I just didn't know how to put a vector arrow above it.

Thanks