b - 4 > 4
Add 4 to both sides to get the variable b on a side and its value on the other side:
b - 4 + 4 > 4+4
b > 8.
So b - 4 > 4 when b > 8.
So every single number above 8.0 is a solution of the inequality. So we can translate to an interval answer:
b - 4 > 4 for b = [8, +∞[
The interval is always opened from the ∞ side because ∞ is not actually a real number
Hope this Helps! :)
