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find the equation of a line that passes through the origin and point (-3,6)

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slope=changeinY/changeinX=0-6 /0--3=-6/3

y=mx+b
since 0,0 is a point, b is zero
y=-2x

I don’t understand please

A straight line passes through the origin and the points (-3,6)find the equation of the line.

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