Consider the following problem:
Input: An undirected graph $G = (V, E)$, each edge has a non-negative weight $w_i$ and a non-negative value $v_i$. There are two vertices to represent start point $s$ and end point $t$. We are also given two values $W,V$.
Decide whether there is a simple path from $s$ to $t$ with total weight at most $W$ and total value at most $V$.
How do I show that the problem is NP-hard by reduction from PARTITION?