Without an equality sign it is no kind of an equation at all.
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It is a mathematical equation.
If y = mx + b, then x = (y-b)/m (for m not equal to zero).
It is a straight line equation whereas m is the slope and b is the y intercept.
It is the equation of a straight line
The equation y = mx + b is the equation for a line in slope-intercept form. The slope is m, and the y-axis intercept is b.