Please show steps on Excel!!!!!

1. Write the following sets of simultaneous equations in matrix form and check the determinant in Excel with MDETERM to see whether there is a solution. If the solution exists, solve the equations using matrix inverse methods. Turn in your written answers and your Excel file with an example calculation for each dimension matrix (3 x 3, and 4 x 4). Name the sheet Problem 1". a) X1 + 8x2 + 4x3 = 0 -X1 + X2 + 7x3 = 7 6x1 + 7x2 -2x3 = 3 b) 7x2 + x3 = 3 3x1 + 6x2 + 3x3 = 8 -3X: + 8x2 -X3 = 2 3x1 + 5x3 = 3 8x1 + 7x2 + 8x3 = 8 3x2 +7x3 =2 4y + 2y2 + y + 5y4 = 52.9 3y + y2 + 4y3 + 7y4 = 74.2 2y + 3y2 +y3 +6y4=58.3 3y1 + y2 + y3 +3y4 = 34.2