Answer:
5
Step-by-step explanation:
*Just a highly recommended guess.*
For first one
Y=6x+21 can’t be changed
X=y/6-7/2
for the second
X=-12+3y
Y=4+x/3
Answer: 110
Reasoning: all of the numbers should add up to 360.
140+110=250
360-250=110
The angles of 110 look the same, go for it.