(1 point) Given that the matrix 1 l 7 9 1 0 5 4 1 1 7 9 can be reduced (using elementary row operations) to the equivalent linear system 1 0 5 4 0 1 72 75 , 0 0 0 0 solve the following system of linear equations :n y - 7z = 9 m 52 = 4 :c y 72 = 9. If necessary, parametrise your answer using the free variables of the system. (You must set the right-most non-leading variable tot if using a single parameter, and if a second parameter is required, then set it to 8-) 2t-4 2t5 urea ||