Fix a matrix A and a vector b. Suppose that y is any solution of the homogeneous system Ax=0 and that z is any solution of the system Ax=b. Show that y+z is also a solution of the system Ax=b.

Question

Gaven Francis

Mathematics

13 November, 10:03

Fix a matrix A and a vector b. Suppose that y is any solution of the homogeneous system Ax=0 and that z is any solution of the system Ax=b. Show that y+z is also a solution of the system Ax=b.

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Kathleen Reilly · Answer 1

Since y is a solution of the homogeneus system then satisfies Ay=0.

Since z is a solution of the system Ax=b then satisfies Az=b.

Now, we will show that A (y+z) = b.

Observe that A (y+z) = Ay+Az by properties of the product of matrices.

By hypotesis Ay=0 and Az=b.

Then A (y+z) = Ay+Az=0+b=b.

Then A (y+z) = b, this show that y+z is a solution of the system Ax=b.