# How do you turn the parametric equations into a Cartesian equation x = t -1 y = -3 t?

The answer is $y = - 3 \left(x + 1\right)$
You have to eliminate $t$ between the two equations.
$x = t - 1$$\implies$$t = x + 1$
$y = - 3 t$$\implies$$t = - \frac{y}{3}$
$\therefore$ $x + 1 = - \frac{y}{3}$
$y = - 3 \left(x + 1\right)$