Please help me i dont understand this

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Can someone answer this question? : )

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?