Sec4.1

  1. Given below is a linear equation.

Y=5+2x

  1. Find the y-intercept and slope.

 

 

 

  1. Determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation.

 

 

 

  1. Use two points to graph the equation.

 

 

 

 

 

 

 

 

 

  1. Given below is the y-intercept and slope, respectively, of a line.

-2 and 5

  1. Determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation.

 

 

  1. Find its equation.

 

 

 

  1. Use tow points to graph the equation.

 

 

 

 

 

 

 

 

  1. A cellular phone company charges $20 for a phone and $30 per month for its economy plan. Let y denote the total cost in dollars and x denote the number of months.

 

  1. Find the equation that expresses y in terms of x.

 

 

  1. Determine and

 

 

 

  1. Construct a table for the x-values 9, 15, and 21.
Time(months) X Cost ($) y
9  
15  
21  

 

  1. Graph the equation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sec4.2

  1. Given to the right are two linear equations and a set of data points.
X 1 2 3
Y 2 5 9

 

Line A: y=1+3x,             Line B: y=-3+4x

  1. Graph the linear equation and data points in one plane.

 

 

 

 

 

 

 

 

  1. Complete tables for ,   for Line A and Line B.

Line A: y=1+3x

x y e
1 2      
2 5      
3 9      

 

 

 

 

 

 

 

 

Line B: y=-3+4x

x y e
1 2      
2 5      
3 9      

 

 

  1. Determine which line fits the set of data points better, according to the least-squares criterion.

 

 

 

 

 

  1. Find the regression equation for the data points. And Graph the regression equation and the data points.

 

X 2 3 4
Y 5 0 1

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