Answer: A. 2
The first thing you want to do is isolate the y, meaning you have to rewrite the equation so that the y is on the left side by itself. The process is as follows.
6x - 3y = 4 Original equation
-3y = -6x + 4 Subtract the 6x from both sides
y = 2x - (4/3) Divide the entire equation by -3
y = 2x - (4/3) is the rewritten equation. According to the equation of a line, y = mx + b, the m is the slope. In this line, m = 2, thus the slope of the line is 2.