For tax and accounting purposes, corporations depreciate the value of equipment each year. One method used is called "linear depreciation," where the value decreases over time in a linear manner. Suppose that five years after purchase, an industrial milling machine is worth $\$710{,}000.00$, and ten years after purchase, the machine is worth $\$340{,}000.00$. Find a formula, $V(t)$, representing the machine value in thousands of dollars at time $t\geq 0$ after purchase.

$V(t) =$