What is b in y=mx+b?

Answer: b is the y-intercept of the line.

Explanation:

The equation of a straight line is ax +by = c 

we can rewrite the above equation in terms of y and it is called slope-intercept form. 

The general equation of a line in slope-intercept form is y=mx+b 

where b is called the y-intercept and m is the slope.

Thus, b is the y-intercept of the line