Question

let vector OP = 2i + 3j and vector OQ = -6i+4j. R is a point on vector PQ such that PR/RQ = k/1, where k>0.
a/ express vector OR in terms of k, i and j.
b/ express (vector OP)dot(vector OR) and (vector OQ)dot(vector OR) in terms of k.
c/ Find the value of k such that OR bisects angle POQ.