a) Consider the parametric equations: x=4t+4 sint y=4t+4 cost Find the value(s) of t for which the tangent to the parametric curve has the same gradient as the line y = x. b) Consider the linear equations: x+y+2=6 2x+2y+4=18x+2y+2=8 Set up an augmented matrix that represents this system of three equations in three unknowns. Then use Gauss Jordan Elimination to reduce the augmented matrix to a matrix in reduced row echelon form. Finally, write down the solution to the system, if one exists.