In the equation Y=mx+b, which is what I believe you mean, 'b' is the y intercept of the graph. In other words, if the equation is plotted in standard Cartesian coordinates, the straight line crosses the y-axis at the height b above the x axis.
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y=mx+b is the equation for a linear relationship. y= the dependant variable m= the slope of the line x= the independent variable b= the y-intercept
If you mean: y = mx+b then it is the formula for a straight line equation whereas m is the slope and b is the y intercept
If you mean: y = mx+b then m is the slope and b is the y intercept.
If you mean 3x+4y = 12 then y = -3/4x +4
The equation y = 13x is in the form "y = mx + b" (in this case, b is zero). Therefore, the equation is linear.