Forces (pi−4j)(p\mathbf{i}-4\mathbf{j})(pi−4j) N, (6i+qj)(6\mathbf{i}+q\mathbf{j})(6i+qj) N and (−2i+9j)(-2\mathbf{i}+9\mathbf{j})(−2i+9j) N act on a particle in equilibrium.
Find p p\,p and qqq.