Answer is
Inequality 65 ≤ -4x +89
Solved X weeks ≥ 6
Step by step
We know the goal = less than or equal to 65
We know the goal is -4 # per week (x)
The dog currently is at 89 #
So 65 ≤ -4x + 89
Subtract 89 from both sides to isolate x
-24 ≤ -4x
x ≥ 6 weeks