Section 3.6
Solving Decimal Equations
Mr. Beltz &
Mr. Sparks
Goal:
Find exact and approximate
solutions of equations that contain
decimals.
Approximate: Near or close
(estimate)
EX. $1.95 approx. $2.00
Basics
Distribute on Both Sides First!
Simply the expression (combine like terms)
Goal: Get the variable to the left side
Solve the Equation using Inverse Relationships
Remember: You always want to solve for the
Variable, “X = ?”
-38x – 39 = 118
-38x + -39 = 118
+39
+39
-38x = 157
-38
-38
X = -4.13
Change Sub --> +
Simply the Equation
Do the Inverse of
Addition [subtraction]
The Inverse of
Multiplication is
Division
24x + 43 = 66
-43
-43
Change Sub --> +
Simply the Equation
24x = 23
24
24
X = 0.96
Do the Inverse of
Addition [subtraction]
The Inverse of
Multiplication is
Division
Practice
P. 163 # 2-3
Show All work
USE YOUR NOTES AS A
GUIDE
Practice P. 163 # 2-3
# 2:
-1.40
#3:
-1.12
Independent Practice
P. 164-165
#’s 4-8
SHOW YOUR WORK
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Lesson 3.6 Solving Decimal Equations ppt