Answer:
x = (-infinity, 8], or x <_ 8
Step-by-step explanation:
Just like with equalities, we can add or subtract anything from both sides of an inequality, and it will still be true. So, our first step is:
5x + 20 ≤ 60
becomes
5x ≤ 40
Next, we can divide both sides by 5 to isolate the variable on the left hand side of the inequality. So,
5x ≤ 40
becomes
x ≤ 8
This means that x can be any number less than or equal to 8.
x ≤ 8
x = (-infinity, 8]
