Find the dimension of the solution space for the system x1+x2+x3+x4=0x_1 + x_2 + x_3 + x_4 = 0x1+x2+x3+x4=0 and x1−x2+x3−x4=0x_1 - x_2 + x_3 - x_4 = 0x1−x2+x3−x4=0.
1
2
3
4