Writing Linear Equations

Parallel Lines

100

The slope parallel to m=-1

m=-1

200

Slope parallel to the line 

y=-3x+7

m=-3

300

Slope parallel to the line 

7y-x=14

m=1/7

Perpendicular Lines

100

The slope perp. to m=-1/3

m=3

200

Slope perp. to the line 

y=4x-1

m=-1/4

300

Slope perp. to the line 

5y-2x=5

m=-5/2

Linear vs. Non-Linear

100

1     4

2     8

3     12

4     16

linear

200

3     23

5     27

7     32

9     38

non-linear

300

2     14

4     17

6     20

8     23

linear

Solving

100

Write the equation of a line in slope-intercept form

y-3x=4

y=3x+4

200

Write the equation of a line in slope-intercept form

m=2 ; (2, 1)

y=2x-3

300

Write the equation of a line in slope-intercept form

(-1, -3) & (2, 12)

y=5x+2

Equations

100

Equation for Slope

m=(y₂-y₁) / (x₂-x₁)

200

Point-Slope Equation

y-y₁=m(x-x₁)

300

Equation of a Line

y=mx+b