Pre-Algebra Demystified

EXAMPLE

Draw the graph of 2x
y¼8.

SOLUTION

Find the coordinates of two points on the line:

Let x¼ 1 Let x¼ 5

2x
y¼82x
y¼ 8

2(1)
y¼ 8 2(5)
y¼ 8

2 
y¼ 810 
y¼ 8

2 
 2 
y¼ 8 
 210 
 10 
y¼ 8 
 10


y¼ 6 
y¼
 2


y


 1

¼

6

1

y


 1

¼

2

1

y¼
6y¼ 2

(1,
6) (5, 2)

Plot the two points (1,
6) and (5, 2) and draw the line through these points
(see Fig. 11-8).

CHAPTER 11 Graphing 211

Fig. 11-8.