What’s the missing reason in the proof?

How many solutions does the nonlinear system of equations graphed bellow have?

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?

What is the equation of a line passing through (-6,5) and having a slope of 1/3