2x-2y+z=3 5y-z=-31 x+3y+2z=-21

Can someone answer it, and plot it, for 20 points and brainliest answer? p. s. they're the same ! : )

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The table shows the number of students who signed up for different after school activities. activity students cooking 9 chess 4 photography 8 robotics 11 select the true statements about the information in the table.