Like-Terms
Are the numbers 3 and 4 like-terms?
Yes
2+x=3
x=1
2x-3=9
x=6
Two brothers had 10 books together. The one brother bought 4 books. How many books did the other brother buy? Write an equation.
4+x=10
What is a variable?
A letter used to represent an unknown number.
What is 3x+4?
3x+4
2x=-12
x=-6
-3x-8=-20
x=4
The Chicago Bulls scored 79 points. The Cleveland Cavaliers scored 13 less points. How many points did the Cleveland Cavaliers score? Write an equation for this sentence.
x+13=79
What is the coefficient?
The number/numerical value
Which two numbers are like-terms? 7o,5p,100o
7o and 100o
x-150=300
x=450
5y+2=12
y=2
The kindergarten section of the school had 12 classrooms. If each classroom can accommodate 15 kids, how many kids can the whole kindergarten section accommodate?
k/15=12
What is an inverse operation?
Opposite operations
Addition<->Subtraction
Multiplication<->Division
5r+2r
a/12=2
a=24
195=100y-5
2=y
Evan is making meatballs and pasta for his friends. He makes 30 meatballs, and wants 5 meatballs on each plate. How many plates will Evan need? Write an equation.
5p=30
Terms with the same variables, but can have different coefficients.
What is 9x+4y+10x?
19x+4y
x+245=440
x=195
23=x/3+26
-9=x
At your local farmers market, it costs $10 to rent a stand, and $7 for every hour you stay there. If you paid a total of $38, how many hours would you stay at the farmers market? Write an equation.
10+7h=38
What is an equation?
Two equal expressions (whenever both sides have the same value)