**QUIZ #2 SOLUTIONS
**

**
Suppose you have a straight line containing the points (-1,7) and
(2,-5).
**

**What is the slope of the line?****Find an equation for the line.**Using the point-slope form:

*y*-7=-4(*x*+1). Alternative,*y*-(-5)=-4(*x*-2). In either case, the formula can be simplified to*y*=-4*x*+3 if you wish.**What is the***x*-intercept of the line?Setting

*y*=0, we get 0=-4*x*+3, 4*x*=3,*x*=3/4. So the*x*-intercept is the point (3/4,0).**What is the***y*-intercept of the line?Setting

*x*=0, we get*y*=3. So the*y*-intercept is the point (0,3).

Fri Sep 11 12:53:01 EDT 1998