How to solve system of equation in Matlab ?

How to solve the system of equations that the number of variable is fewer than the number of equations. for example:

x + y + 2z = 0,
2x + y -z = 0.

the result is

x = 3t,
y=-5t,
z=t.(t is parameter)

thanks you very much.

Answer 1

[Matt J]

Or numerically,

null([1 1 2; 2 1 -1])

Answer 2

[Azzi Abdelmalek]

sol=solve('x + y + 2*z = 0','2*x + y -z = 0','x','y') 
x=sol.x
y=sol.y