Need help working with multiplying and working with matrixes in R.

Here are the three matrixes and two vectors:

A=[1 5 7 8 B= [-1 5 -7 8 C=[ 5 8 0 7 x = (1 y = (1

2 7 9 5 2 -7 9 -5 -1 -6 5 6 0 2

3 9 6 7 -3 9 -6 7 2 0 2 3 ] -1) 3

4 13 7 6] 4 -13 7 -6] 4)

1. Find B^-1 y. // I get a non-comfodable arguments when I do solve(B) %*%y.

2. Find svd of C.

3. Find the condition number of A and C.