5h + 2 + 2h
7h + 2
2(x + 5)
2x+10
Simplify. 8b + 3b
11b
19+n=30
n=?
N=11
What is a variable
The unknown in math usually represented by a letter.
Like x or y.
3b + b - 8
4b - 8
5(d - 2)
5d-10
Simplify. 19x - 24x
-5x
19=14+k
k=?
k=5
What does an equation have to have to make it an equation?
= sign
3a + 12 - 6a
-3a + 12
7(4 - t) =
28-7t
Simplify. 3 + 5(a + 4)
5a + 23
3.5+b=4.5
b=1
What is a term?
a number(s) or variable with a +or - sign.
-3y + 4 + 5y
2y + 4
2(x - 9+3c)
2x-18+6c
The hanger image below represents a balanced equation. Write the equation.

27=b+9
s+2.5=5
s=2.5
How many terms in this expression?
24+4b-3c+c
There are 4
3c + 12b - c + 4
2c + 12b+ 4
13(4 + 2a-4f)
52+26a+52f
Which expressions are equivalent to 2r+(t + r)?
Choose all answers that apply:
A 2rt+4r
B r+t
C 3r+t
C 3r+t
r-4.5=100.3
r=104.8
WRITE AN EQUATION & SOLVE: Julie is 3 years older than her sister. Julie's age is 11 years old. How old is her sister?
n - Julie's sister's age n + 3 = 11 n = 8 Julie's sister is 8 years old.