Writing Equations In Slope Intercept Form Page 2
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1
2Algebra 1 Review
Writing Equations of Lines
Name___________________
1
Perpendicular lines -- opposite reciprocals
Ex:
y
x
, 6
, 1
1
2
-One positive and one negative
m
2
-Flip-flop the numbers
y
1
2
x
1
solve for y.
Write the equation of the line that is perpendicular to the given line and passes through the given point
1
x
16.
y
; 3
, 2
4
17.
y
x
; 9
5
2 ,
2
4
18.
y
3
x
; 7
, 3
1
19.
y
x
; 6
8
3 ,
5
Two Points:
To write an equation given two points:
Ex:
4
8 ,
and
1
2 ,
8
2
6
m
2
1. Find m.
4
1
3
2. Select a point.
1
2 ,
3. Substitute m and the point.
y
y
m
(
x
x
)
y
2
2
x
1
1
1
y
2
2
x
2
4. Change to slope-intercept form.
y
2
x
y
mx
b
Write in slope-intercept form the equation of the line that passes through the given points.
20.
0
8 ,
and
1
3 ,
21.
7
9 ,
and
, 5
3
22.
4
2 ,
and
3
5 ,
23.
, 1
7
and
, 3
15
24.
, 6
2
and
10
,
14
25.
4
5 ,
and
, 8
4
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