A linear function has the form y=kx+b. Its graph is a straight line. The parameter k controls the slope, and b is the vertical shift along the y-axis (the y-intercept).
k is the slope of the line
b is the value of the function at x=0
Two points are enough to draw the line
See how the graph changes for different k and b.
y = 2x + 1
From the graph: at x = 3, y = 7.
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