Please help me with number 10 . I’ll give as many points as you want please help me I’m stressing

Having a hard time understanding this question (see attachment).

The equation of line wx is y=2x-5. write an equation of a line perpendicular to line wx in slopeintercept form the contains points (-1,-2)

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?