the problem statement is ambiguous

we can call the point D(-5,-5) as a point pair (x,y) and we assume that 'units up' is an understand reference to translating upward along the y-axis

translating up 3 units would be adding +3 to the y-component, hence:
D(-5,-5+3)=D(-5,-2)

So the resulting point would be D(-5,-2).