5

5

Point-Slope form is an alternative to Slope-Intercept form and conforms to (y - y₁) = m(x - x₁), where y₁, x₁ is any point on the line and m is the slope. It is a more general version of the Slope-Intercept since it can be writen using any point instead of requiring you to know where it crosses the y-axis.

If you insert the y-intercept (0, b) into the equation and reduce it:
(y - y₁) = m(x - x₁)
(y - b) = m(x - 0)
y - b = mx
y = mx + b

You can see how it transforms into the Slope-Intercept form you have already studied.