Miscellaneous
An equation has an.....
Equal Sign (=)
M / 16 = 8
m = 128
9x + 1 = 82
x= 9
b/8+10=4
b = -48
2/5x-11=49
y = 150
The letter in an equation is called the....
variable
x − 7 = 13
x = 20
15=x/2+3
x=24
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?
DOUBLE VALUE
30h + 50 = 170
h= 4 hours
What is an inverse operation?
The opposite of a given operation.
4+ p=11
p =7
3x+10=7
x= -1
−2 = 2 + v/4
v= -24
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?
DOUBLE VALUE
1,000 + 30w = 2,800
w = 90
When solving an equation, what is the goal?
To isolate the variable
Twice a number is 34.
n= 17
10 + 6v = 124
v= 19
x/4-6=-5
x= 4
You earn $15 per hour at your job. Each way, you pay $2.50 in bus fare. How many hours do you have to work in a day to take home $100?
DOUBLE VALUE
15h - 5 = 100
h= 7 hours.
What is the inverse operation of (3/8)x
Multiply by the reciprocal of 8/3 or 3/8x (8/3) = 1x
m − 9 = −13
m = -4
The computer club sells 50 more than 3 times the number of pins the chess club sells. The computer club sold a total of 134 pins. How many pins does the chess club sell?
DOUBLE VALUE
3p + 50 =134
p= 28