Homogenic Linear System Proof

32 Views Asked by At

I need help approaching this question,
any help will be much appreciated.

Assume that a linear system exists over $\Bbb{R}$ so that its solution group is: $$S=\{(a,a^2,b)|a,b \in \Bbb{R}\}$$ Prove that system is homogenic

1

There are 1 best solutions below

0
On

No linear homogeneous system can have a set of solutions $S$ of this form.

Indeed the solution set of a homogeneous linear system is a vector space, in particular is stable by scalar multiplication.

But, here is a counterexample: taking $a=b=1$, $(1,1,1) \in S$ whereas its double $2*(1,1,1)=(2,2,2) \notin S$ because the second coordinate isn't the square of the first one.