Two forces whose resultant is 100 N are at angle to each other. If one of them makes
an angle of 30° with the resultant,
determine its magnitude.

the man is bald so he has no hair to get wet

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)