General
An equation has an.....
What is an Equal Sign (=)
x + 12 = 15
x = 3
−9x + 1 = −80
x = 9
What is the first step you would take to solve 15x + 18 = 264
Subtract 18 from both sides
l -12 l
What is 12
What represents an unknown value?
What is a variable
m - 9 = -13
m = -4
10 - 6v = -104
v = 19
7m = 77
m = 11
sqrt(121)
121
What is an inverse operation?
What is the opposite of the given operation or operations that "undo" each other
-11 = - 4 + p
p = - 7
-12 = 16 - 1/2x
x = 56
Your class budgets money from the class treasury for a school dance. Decorations will cost $50. The DJ charges $30 per hour. If your class has a total of $170 to spend on the dance, how many hours can you pay a DJ?
x = 4 hours
4x(5y- 3 + 7z)
20xy - 12x + 28xz
When solving an equation, what is the goal?
What is isolate the variable
- 5x = - 60
x = 12
x/(-5) + 74 = 61
DAILY DOUBLE
x = 65
5.7 + 1.9 + x = 19.4
x = 11.8
What happens when you add a number and its opposite?
you get 0.
The inverse operation of a Square
Ex:
x^2
What is square root?
x/(3) = -5
x = -15
7/4 = 9/4 + 1/2b
b = -1
You want to go to Africa for a photo safari. You need a total of $2,800. You can get $1,000 from your savings account and you can save $30 per week. How many weeks will it take you to save up for the trip?
$30w + 1000 = 2,800
w = 90 weeks
Factor:
81x-27xy+9xz
9x(9-3y+z)