How is the constant of proportionality represented in scale drawings?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

What does the sign of the slope tell you about a line?

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?