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y=2x is an equation that passes through those points

cjack3

y=2x is your answer 
First you do slope formula y2-y1/x2-x1
4+2/2+1
=2
Then you use your slope and one of the points in the point slope formula y-y1=m(x-x1)
y-4=2(x-2)
y-4=2x-2
y=2x

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