Transcript Course 2 Lesson 4

Lesson 4-2
Pages 156-159
Solving Addition
and Subtraction
Equations
What you will learn!
How to solve addition and
subtraction equations.
Inverse operations
What you really need to know!
Equations must always remain
balanced. If you subtract the
same number from each side of
an equation, the two sides
remain equal. Also if you add
the same number to each side of
an equation, the two sides
remain equal.
Balance Example
Example 1: Solve
14 + y = 20
-14
-14
0+y=6
y=6
Example 2: Solve
z – 8 = 12
+8 +8
z + 0 = 20
z = 20
Example 3: Solve
x+3=1
- 3 -3
x + 0 = -2
x = -2
Example 4: Solve
-9 = q – 8
+8
+8
-1 = q + 0
-1 = q
Example 5: Solve
If a golfer had scores of -1, -4,
and -3 on his first three rounds in
a tournament, what was his
fourth round score if his final
score was -18?
-8 + f = -18
Example 4: Solve
-8 + f = -18
+8
+8
0 + f = -10
f = -10
Page 158
Guided Practice
#’s 4-10
Read:
Pages 156-158
with someone at
home and study
examples!
Homework: Page 159
#’s 12-38 even
#’s 40-50
Lesson Check 4-2
Page
572
Lesson 4-2
Lesson Check 4-2