Transcript notes 2.1

Solution:
A number that makes the equation true.
Solving 2-step equations
Day 1, lesson 2.2
Objective: solve for the unknown
x + 7 = 10
- 7 -7
x
=3
P E M A
D S
11c + 7 = 51
- 7 -7
11c
11
= 44
11
c =4
P E M A
D S
3 = 3n + 9
-9
-9
-6 = 3n
3
3
-2 = n
P E M A
D S
6x + 14 = -40
-14 -14
6x
6
= -54
6
x = -9
P E M A
D S
x - 5 = 4
3
___+ 5 + 5
x
3(
3
)
= ( 9) 3
x = 27
P E M A
D S
6 + x = 4
5
-6
-6
x
5(
5
)
= (-2)5
x = -10
P E M A
D S
11x + 5x = 48
P E M A
D S
16x = 48
16x
= 48
16
16
x =3
Using an equation as a model
You are making a bulletin board to advertise community service opportunities in your
town. You plan to use half a sheet of construction paper for each ad. You need 5
sheets of construction paper for a title banner. You have 18 sheets of construction
paper. How many ads can you make?
know
-paper per ad: ½ sheet
-paper per banner: 5
sheets
-total paper: 18 sheets
need
The number of
ads you can
make.
plan
Write and solve an
equation. Let the
variable represent
the unknown.
Let a = the number of ads you can make.
1 a + 5 = 18
2
-5 -5
1 a
= 2(13 )
2 2
a = 26
( )
You can make 26
community service
ads for the bulletin
board.
Assignment
• Book page 91: 11-25, 54,56
• Show all of your work.