Q. 4.9 - Elementary Statistics

Question

In Exercise 4.9, we give linear equations. For each equation,

a. find the $y$-intercept and slope.

b. determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation.

c. use two points to graph the equation. 

Given equation is,

$y=0.5x-2$

Step-by-Step Solution

Answer

a. $y$-intercept is $-2$ and slope is $0.5$

b. Slope is upward.

c. The graph is given below

Part(a) Step 1: Given information

We need to find $y$-intercept and slope of given linear equation

Part(a) Step 2: Calculations

General form of linear equation is $y=mx+c$ where  $m$ is slope and $c$ is intercept.

Comparing $y=0.5x-2$  with general form we get,

slope $m=0.5$

y-intercept $c=-2$

Part(b) Step 1: Given information

We have to determine the direction of slope of given linear equation.

Part(b) Step 2: Answer and its explanation

As we see the slope is having positive sign so the slope will point in upward direction.

Part(c) Step 1: Given information

We have to graph the equation.

Part(c) Step 2: Explanation

Graph for above linear equation is