What is the y intercept of y = x-3

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Measure a and b and find their sum. how are the angles related?