A line perpendicular to the given line should have a slope which is a negative reciprocal of the given slope.
In the given, the slope is -2/3. Thus, the new slope should be m=3/2.
To obtain the line with the slope 3/2 and passes through (4,-8), substitute the value of the slope and the coordinates into the point-slope formula and then simplify the right side of the equation.

Thus, the values for the blanks should be 3, 2, and -14, respectively.