The line defined by the equation y= -4/7x + 5 is perpendicular to the line defined by which equation?

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Tan198=asin164=? how to solve this? ?