Mathematics
Grade 9
15 min
Graph solutions to one-step linear inequalities
Graph solutions to one-step linear inequalities
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Solve one-step linear inequalities using addition and subtraction.
Solve one-step linear inequalities using multiplication and division.
Correctly apply the rule for multiplying or dividing an inequality by a negative number.
Graph the solution set of a one-step linear inequality on a number line.
Distinguish between open and closed circles when graphing an inequality.
Interpret a number line graph to write the corresponding inequality.
Ever needed to know the minimum score to pass a test or the maximum you can spend on a game? 🤔 That's an inequality!
This tutorial will teach you how to solve simple inequalities that require just one step. You will then learn how to visually represent all the possible solutions on a number line, a key skill for und...
2
Key Concepts & Vocabulary
TermDefinitionExample
InequalityA mathematical statement that compares two values that are not equal. It uses symbols like > (greater than), < (less than), ≥ (greater than or equal to), and ≤ (less than or equal to).x + 4 < 10
Solution SetThe set of all numbers that make an inequality true. Unlike equations which often have one solution, inequalities have an infinite range of solutions.For x > 5, the solution set includes 5.1, 6, 10, 100, and all other numbers greater than 5.
Inverse OperationThe operation that reverses the effect of another operation. We use inverse operations to isolate the variable.Subtraction is the inverse of addition. Division is the inverse of multiplication.
Number Line GraphA visual representation of an inequality's solution set on a line.A graph...
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Core Formulas
Addition and Subtraction Properties of Inequality
If a > b, then a + c > b + c and a - c > b - c.
You can add or subtract the same number from both sides of an inequality without changing the direction of the inequality symbol. This works for all four inequality symbols (<, >, ≤, ≥).
Multiplication and Division Properties of Inequality (Positive Number)
If a > b and c > 0, then ac > bc and a/c > b/c.
You can multiply or divide both sides of an inequality by the same POSITIVE number without changing the direction of the inequality symbol.
Multiplication and Division Properties of Inequality (Negative Number)
If a > b and c < 0, then ac < bc and a/c < b/c.
CRITICAL RULE: When you multiply or divide both sides of an inequality by a...
4 more steps in this tutorial
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Challenging
The solution set for the inequality ax < 20 is graphed with an open circle at -5 and shading to the right. What is the value of 'a'?
A.4
B.-4
C.5
D.-5
Challenging
The graph of the solution to x + c ≥ 8 has a closed circle at 3. What is the graph of the solution to -cx < 25?
A.An open circle at -5 with shading to the right.
B.An open circle at 5 with shading to the right.
C.An open circle at -5 with shading to the left.
D.An open circle at 5 with shading to the left.
Challenging
Given that -k > 0, which of the following inequalities is equivalent to kx < 6k?
A.x < 6
B.x > 6
C.x < -6
D.x > 6
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