Final answer:
The correct function rule for a line with a slope of 2 and a y-intercept of 3 is y = 2x + 3, which corresponds to option D.
Step-by-step explanation:
To determine the correct function rule for a line with a given slope and y-intercept, we use the slope-intercept form of a linear equation, which is y = mx + b, where m represents the slope and b represents the y-intercept. In this case, the slope (m) is 2 and the y-intercept (b) is 3. Therefore, the correct function rule is y = 2x + 3. This matches option D from the given choices.