provide detailed handwritten solution. don't copy from other sites.

a) Solve the simultaneous equations below using crammer's method 4x+2y+32=4 5x+6y+1z=2 2x+3y=-1 b)Two salesmen A and B are working in a certain district. From a survey conducted by the head office, the following results were obtained. State whether there is any significant difference in the average sales between the two salesmen at 5% level of significance. No. of sales Average sales in kshs Standard deviation in kshs