Final answer:
The values of 'a' and 'b' in the equation determine the slope and y-intercept of the line.
Step-by-step explanation:
The graph of a linear equation written in the form X/a + y/b = 1 represents a straight line. The values of 'a' and 'b' determine the slope and y-intercept of the line. The 'a' value affects the horizontal movement of the line, while the 'b' value affects the vertical movement of the line.
For example, if 'a' is positive, the line will slope upward to the right, and if 'a' is negative, the line will slope downward to the right.
Similarly, if 'b' is positive, the line will cross the y-axis above the origin, and if 'b' is negative, the line will cross the y-axis below the origin.