4х + Зу = 2
Зx — Зу = — 9

I’m stuck on this i don’t understand.

Two fire-lookout stations are 190 miles apart, with station a directly south of station b. both stations spot a fire. the bearing of the fire from station a is upper n 55 degrees upper e and the bearing of the fire from station b is upper s 60 degrees e. how far, to the nearest tenth of a mile, is the fire from each lookout station?

Abcd is a square. what is the measure of angle bac