Lesson 5
Efficiently Solving Inequalities
Let’s solve more complicated inequalities.
Problem 1
- Consider the inequality \(\text-1 \leq \frac{x}{2}\).
- Predict which values of \(x\) will make the inequality true.
- Complete the table to check your prediction.
\(x\) -4 -3 -2 -1 0 1 2 3 4 \(\frac{x}{2}\)
- Consider the inequality \(1 \leq \frac {\text{-}x}{2}\).
- Predict which values of \(x\) will make it true.
- Complete the table to check your prediction.
\(x\) -4 -3 -2 -1 0 1 2 3 4 \(\text-\frac{x}{2}\)
Problem 2
Diego is solving the inequality \(100-3x \ge \text-50\). He solves the equation \(100-3x = \text-50\) and gets \(x=50\). What is the solution to the inequality?
A:
\(x < 50\)
B:
\(x \le 50\)
C:
\(x > 50\)
D:
\(x \ge 50\)
Problem 3
Solve the inequality \(\text-5(x-1)>\text-40\), and graph the solution on a number line.
Problem 4
Select all values of \(x\) that make the inequality \(\text-x+6\ge10\) true.
A:
-3.9
B:
4
C:
-4.01
D:
-4
E:
4.01
F:
3.9
G:
0
H:
(From Unit 4, Lesson 3.)
-7
Problem 5
Draw the solution set for each of the following inequalities.
-
\(x>7\)
-
\(x\geq\text-4.2\)