Question

All answers must be integers!
2+2x+y+z=1
3w-x-2y+z=0
w+2x+y-z=7
w-x+2y-2z=4

Answer 1

solve them by matrix methad

Answer 2

ok

Answer 3

but it takes too long and i don't know how to it correctly.

Answer 4

then go for determinants

Answer 5

?

Answer 6

cramers rule...

Answer 7

never heard of it our teacher ha not explained that

Answer 8

\[\left[\begin{array}{cccc} 0&2&1&1\\3&-1&-2&1\\1&2&1&-1\\1&-1&2&-2\end{array}\right|\left.\begin{array} {c}w\\ x\\y\\z\end{array}\right]=\left[\begin{array} {c}-1\\0\\7\\4\end{array}\right]\]