Direct proportionality is given by y=kx (that is, b=0). Its graph is a straight line through the origin (0,0).
The coefficient k shows how quickly y grows or decreases as x changes.
Direct proportion: y=kx
The graph always passes through (0,0)
The sign of k tells whether the line rises or falls
Case b=0: the line goes through the origin.
y = 2x + 0
From the graph: at x = 3, y = 6.
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