Answer:
The answer to your question is below
Step-by-step explanation:
Part A.
-3x + 7y = 13
Solve the equation for "y"
7y = 3x + 13
y = 
Part B.
Two lines are parallel if their slopes are the same
Two lines are perpendicular if their slope are opposite reciprocals
Slope of the first line = 
Slope of the second line = 
Conclusion: the lines are parallel because their slopes are the same.
The percentage change from 339 to 420 is 21.34387%
Answer:
logical Sistema is excellent so good