Solving Two-Step Equations
Solving Two-Step Equations
Unit 7 Lesson 1
SOLVING TWO-STEP EQUATIONS
Students will be able to: Solve two-step equations by undoing
mathematical operations
Key Vocabulary:
? Two-Step equation ? Order of Operations
SOLVING TWO-STEP EQUATIONS
A Two-Step Equation is an equation that can be solved in two steps using the properties of equality and undoing the mathematical operations.
If is the variable in the equation, then the two-step equation can be of the forms:
+ =
- =
+ =
- =
( + ) = + =
( - ) = - =
SOLVING TWO-STEP EQUATIONS
Undoing the Order of Operations
While simplifying the mathematical expressions, the order of operations followed is PEDMAS.
When Simplifying DO
Name ( ) ? ? + -
Operation Parenthesis Exponents Divide, Multiply Add, Subtract
When Solving Equation UNDO
When solving an equation, we undo the operations in equation in the opposite sequence i.e. from bottom to top.
SOLVING TWO-STEP EQUATIONS
Solving Two-Step Equations without Parenthesis
In solving these types of equations, we first add or subtract and then multiply or divide according to the equation.
+ = + =
- = - =
SOLVING TWO-STEP EQUATIONS
Problem 1: Solve - = .
SOLVING TWO-STEP EQUATIONS
Problem 1: Solve - = .
Step 1 Step 2
- + = + Addition Property of Equality
=
=
Division Property of Equality
=
SOLVING TWO-STEP EQUATIONS
Problem
2:
Solve
+
=
.
................
................
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