## Chapter 13, Lesson 9

**13-9.A** understand the direction of a graph **For which coordinates will points P and Q determine a line that is falling? I**

*P*(—5, 0) and

*Q*(0, 5)

**II**

*P*(—3, 5) and

*Q*(3, 5)

**III**

*P*(0, 5) and

*Q*(5, 0)

**(a)**I only

**(b)**II only

**(c)**III only

**(d)**I and III only

**13-9.B** identify possible values for the slope of a line **Which statement is true about the slope of a line? I **When a line and the positive portion of the

*x*-axis form an acute angle, that line has a positive slope.

**II**When a line and the positive portion of the

*x*-axis form an obtuse angle, that line has a negative slope.

**III**A horizontal line has a slope of 0.

**(a)**I, II, and III only

**(b)**I and II only

**(c)**I and III only

**(d)**II and III only