y = mx + b
When x = 0, b is what is left on the right hand side of the equation. So the point is (0,b). This is more commonly called the y intercept. For example
y = 4x + 6
When x is 0 you get
y = 4(0) + 6
y = 0 + 6
y = 6
So in this case 6 is the y intercept. and the equation becomes y = 4x + 6
Answer: y intercept
