I need help! I will give brainliest, if correct! For a certain value of $k$, the system

\begin{align*}

x + y + 3z &= 10, \\

-4x + 3y + 5z &= 7, \\

kx + z &= 3

\end{align*}has no solutions. What is this value of $k$?

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.