Matrices help please! (1 Viewer)

[mattsteel87]

Can anyone explain the following questions please:

1) For what value of k does the system of equations shown have no solution. (Use a matrix approach to the problem)

x + ky = 1
kx + y = 1


2) For which values of c does the system of equations shown have a solution? (This is best done using a matrix approach and you can use the internet to find the inverse of the 3 x 3 matrix to save some work if you want)

x - y - 3z = 3
2x . + z = 0
2y +7z = c



3) .



Thanks!

 

[realcareerchats]

For no solutions the determinant has to be zero...which is ad-bc in the matrix of coefficients...so solve 1-k^2=0 to find values of K such that there are no solutions