The x-intercept of an equation is the value of x when y is set to be equal to zero. On the other hand, the y-intercept is the value of y when x is set to be equal to zero. From the equation,
x-intercept : 3x - 9y = 10.8
3x - 9(0) = 10.8
x = 3.6
y-intercept: 3x - 9y = 10.8
3(0) - 9y = 10.8
y = -1.2