-.30x+.20y +.25z =0

.20x -.40y +.05z =0
.10x +.20y -.30z =0

x=?
y=?
z=?

1 answer

no matter how you add/subtract or multiply/divide the left side of the equations, the right side remains zero
So clearly
x = 0
y = 0
z = 0

or each plane passes through the origin.
So they all intersect at the origin (0,0,0)