Answer:
Step-by-step explanation:
It is (3,-1).
7x+2a=3x+5a
7x-3x = 5a -2a
4x = 3a
x = 3a/4
tan 10 degrees.
tan x = cot (90 - x) so:
cot 80 = cot (90 - 10)
= tan 10.