Any clue anyone? bit stuck​

Rose drew a regression line for this paired data set. her line passed through (1, 2) and (3, 5) . what is the equation of rose's regression line?

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Consider the system: y = 3x + 5 y = ax + b what values for a and b make the system inconsistent? what values for a and b make the system consistent and dependent? explain