Quick Graphs Using Slope-Intercept Form Worksheet With Answer Key Page 2
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1
2
3Find the slope and the y-intercept of the graph of
Checkpoint
the equation.
3x
8
1. y
4
3x
2. 2x
3
3. y
y
4
3
slope:
3;
slope:
2;
slope:
;
4
y-intercept: 4
y-intercept:
3
y-intercept:
2
Graphing Using Slope and y-Intercept
Example 2
Graph the equation
2x
y
3.
3
Write the equation in slope-intercept form.
2x
3
1
y
3
1
3
1
Find the slope and the y-intercept.
2
(0,
3)
2
3
m
b
1
Plot the point (0,
3
). Then draw a
triangle to locate a second point on the line.
2
r
i
s
e
m
1
r
u
n
Draw a line through the two points.
Identifying a Family of Parallel Lines
Example 3
Which of the following lines are parallel?
line a:
2x
y
4
line b: x
2y
6
line c: 8x
4y
5
Solution
Begin by writing each equation in slope-intercept form.
1
5
2x
4
x
3
2x
line a: y
line b: y
line c: y
2
4
a
c
2
Lines
and
are parallel because each has a slope of
. Line
b
is not parallel to either of the other two lines because it has
1
a slope of
.
2
82
Algebra 1 Notetaking Guide • Chapter 4
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