# geometry

equation of a line with the co-ordinates(10,0),(11,2),(12,4),(13,6) and (14,8)

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1. x1=10 y1=0

x2=11 y2=2

y2-y1=2-0=2

x3=12 y3=4

y3-y2=4-2=2

x4=13 y4=6

y4-y3=2

x5=14 y5=8

y5-y4=2

equation of a line :

y=2x-20

Proof:

x=10
y=2x-20=2*10-20=20-20=0

x=11
y=2x-20=2*11-20=22-20=2

x=12
y=2x-20=2*12-20=24-20=4

x=13
y=2x-20=2*13-20=26-20=6

x=14
y=2x-20=2*14-20=28-20=8

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