30% of 260 is 78, that mean the difference between brigantines and men of war was 78, next use 260-78=182, 182 is the number of men of war. SO finally we will combine those answer together, 260+182=442 soldiers took part in the battle, hope this help.
Well it varies for how many lines you put on the graph, if you use desmos the answer comes out as 40 units; 25 units to the right of (-4,1) and 20 down