Show:
Parallel/Perpendicular/Neither
Writing Equations of Parallel Lines
Writing Equations of Perpendicular Lines
Identifying the Center & Radius of a Circle
Completing the Square to find the Center and Radius of a Circle
100

y=1/2x+7 and 2x+y=-5

These lines are perpendicular. 

100

(4,1) y=4x-7

What is y=4x-15

100

(2,-3) y=1/2x+6

what is y=-2x+1

100

(x-4)2+(y+1)2=36

Center: (4,-1)

Radius: 6

100

x2+2x+y2+4y=11

Center- (-1,-2)

R= 4

200

y=2x+5 and -2x+y=12

These lines are parallel.

200

(2,-6) y=3x+9

What is y=3x-12

200

(-3,2) y=-3x-4

y=1/3x+3

200

(x+2)2+(y+5)2=81

Center: (-2,-5)

Radius: 9

200

x2+6x+y2-7=0

Center- (-3,0)

R=4

300

y=3x+5 and 2y=6x+10

These lines are parallel. 

300

(-4,3) y=1/2x+7

What is y=1/2x+5

300

(-3,1) y=1/3-4

y=-3x-8

300

x2+(y-6)2=100

Center: (0,6)

Radius: 10

300

x2+y2+8y-9=0

Center- (0,-4)

R=5

400

-x+4y=9 and 2x-8y=-1

These lines are parallel.

400

(4,-2) y=-2x+7

What is y=-2x+6

400

(-5,-4) y=-5x+3

y=1/5x-3

400

(x-7)2+(y+3)2=25

Center: (7,-3)

Radius: 5

400

x2+y2+14x-12y+4=0

Center- (-7,6)

R=9

500

4x+8y=16 and y=5x+1

These lines are neither. 

500

(-1,4) y=3x+2

What is y=3x+7

500

(0,4) y=5x-3

y=-1/5x+4

500

(x-1)2+(y-2)2=16

Center: (1,2)

Radius: 4

500

x2+4x+y2+6y-36=0

Center- (-2,-3)

R=7