1. Objective- To graph horizontal and vertical lines.
x + y = 5 x y -2 7 y -1 6 5 1 4 2 3 3 2 4 1 5 x 6 -1

2. Graph.
y = 3
Line is Horizontal x y y -2 3 -1 3 3 1 3 2 3 x 3 3 4 3
Any line in the
form y = k will
be horizontal. 5 3

3. Graph.
x = -2
Line is Vertical x y y -2 -2 -2 -1 -2 -2 1 -2 2 x -2 3 -2 4
Any line in the
form x = k will
be vertical. -2 5

4. Review x = k y = k Horizontal Line Vertical Line Y-axis is vertical,
but y = k line
is horizontal.
X-axis is horizontal,
but x = k line
is vertical.

5. A) Graph x = -4 on a number line.
B) Graph x = -4 on a coordinate plane. y x

6. Problem
Mac had $580 in his bank account. He must
maintain a balance of $300 to avoid a service
fee. How long can he withdraw $20 per week
without paying the fee? x y
Let x = # of weeks
580
Let y = account balance 5
480
Bank Balance 10
380
Y = x 15
280

7. Let x = # of weeks Bank Balance Let y = account balance Y = 580 - 20 x
Minimum Balance
600
500
400
300
200
100
580
Y = 300 5
480 10
380
Account Balance 15
280
x = 14 weeks
Weeks