Fun with Equations
Solve: 4x + 7 = 31
x = 6
4x + 8 = 2x + 12
x= 2
What is a variable
a symbol or letter to represent an unknown number
What is an equation?
an expression with an equal sign
Solve: 3x - 4 = 17
x = 7
Write an algebraic equation for
I bough 5 tickets to the movies and 1 coke for 4$. In total I spent $29.
5x + 4 = 29$
Use the balance model to solve
7x + 40 = 89
x=7
What is an expression?
Solve: 3x + 3 - 2x = 21
x = 18
Solve using algebra tiles
4x + 12 = 3x + 15
x = 3
Use the balance model to solve
8p -4 = 60/2
p= 8
What are the 3 ways/strategies you can solve an algebraic equation?
Guess and check
Algebra tiles
Balance model ( opposite operation)
Solve:
8p + 4 =68
p = 8
Write an equation for the following.
I am having a party for 60 people. I have 12 tables. How many can sit at each table.
12x=60
x/2 + 25 = 30
x =10
2n + 5 = 17
Solve: x + 6 = 9
x = 3
9x + 3 = 7x + 7
x= 2
100 + p = 100/3
p=50
solve using algebra tiles
3n + 4 = 2n + 6
n=2