Replace the distributed loading by an equivalent resultant force and specify where its line of action intersects member AB, measured from A.
Given:
{ w }_{ 1 } = 200 \frac { N }{ m }
{ w }_{ 2 } = 100 \frac { N }{ m }
{ w }_{ 3 } = 200 \frac { N }{ m }
a = 5 m
b = 6 m