What is the first step in constructing the perpendicular to line / at point N ?

The graph of a line gets what as the value of the slope gets bigger

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Ineed to know the answer to this algebra question.