Parametric equations of lines with one parameter being zero

Question

Parameterize a line from $(1,0)$ to $(-1,0)$. Positivly oriented.

The answer says $x=x$, $y=0$.

My question is, why didn't the formula $r(t)=(1-t)(x_1,y_1)+t(x_2,y_2)$ work?

Answer 1

it works $$\vec{x}=[1,0]+t[-2,0]$$ and $t$ is a real number