Ratio estimation — from a size-2 SRSWOR sample

Consider the following hypothetical population of 6 units. What is the estimated value of population total of $y$-variable based on SRSWOR sample of 2 units selected as unit 4 and unit 6 from the population using ratio method of estimation:

$$\begin{array}{c|ccccc} \text{Unit No.} & 1&2&3&4&5&6\\\hline x & 0&1&3&6&8&10\\ y & 1&3&11&18&29&46 \end{array}$$