Write a Matlab code to solve the below system of linear equations to find the variables a, b and c using matrix is shown below. Write explanation/comments for each line

of code. (15 points) -5 a+7 b+9 c=-25 7 b+6 c=17 -3 a+6 b+2 c=-13 ii. Write a matlab code to solve the below second order equation in matlab to find the variable z. Write explanation/comment for each line of code. (10 points) 8 z^{2}+2 z-3=0