Finding the Y-Intercept of a Linear Function

Consider a linear equation represented by the function f(x) = mx + b, where m is the slope and b is the y-intercept. A line is drawn in a coordinate plane that passes through the points (4, 3) and (10, 9). In this case, the slope of the line can be calculated using the formula:

m = (y₂ - y₁) / (x₂ - x₁)

If the line can be described by a function of the form f(x) = mx + b, find the value of b when f(0) is computed.

Enter your answer in the grid provided. Do not include any units.