Standard form of ...
the equation of a straight line
With 
B you can set
any slope of line g through the origin.
With 
you can move g up and down.
In general:
Graph of linear functions with the equation
y = mx ± t are straight lines.
This equation is also called
the standard form of a straight line.
Here m denotes the slope
and t is the y-intercept of the line.
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