Thank you for the opportunity to help you with your question!
First we find the slope:
m = y2 - y1 / x2 - x1
= 12 - 8 / 4 - 2
= 4/2 = 2
So, y = 2x + b
Since the line passes through the origin, b = 0
Therefore the equation of the line is
y = 2x
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