4. A system of equations is given as follows: x + y + 22 = 1 and kx + 2y + 42 = k a) For what value of k does the system have an innite number of solutions? Determine the solution for this value of k. b) Is there any value of k for which the system does not have a solution? Why or why not? 5. a) Construct a system of three equations that could produce the result of Section 9.4 #2 in the Nelson e- book. b) Construct a system of three equations that could produce the result of Section 9.4 #3 in the Nelson e- book