definition
What is a variable?
Variable is an UNKNOWN number. (e.g., x, y, b, c)
What an inverse operation for +
minus/ subtraction
7=S+5
S= 2
6m = 2
m = 1/3
On Halloween night, Ginny went trick-or-treating at 12 houses. If Fernando visited 9 more houses than Ginny did, how many houses did he visit?
H = 21
Earth
How many horns did a Triceratops have?
three
6=7-L
L=1
5=R x 1
R=5
Avery buys organic almonds priced at $77 from the grocery store. How much did she pay the cashier, if she received $23 in change?
m = 100
Which one is an example of an expression and WHY?
1) 3x+4y=56
2)45y=356
3)5c-54
4)4r x 4= 123
3) 5c-54 because it does not contain an equal sign
What is an inverse operation for division
If Ms. Kaelle and 25 students and 11 of them are blonde, how many students does she have?
25
9f = 27
f = 3
Riley is buying lunch for his friends. Three people order a turkey sub, and he gets the $7.50 roast beef sub. If the total for the order was $22.50 (there's no tax), what equation would you write to solve for the cost of each turkey sandwich AND how much do they each cost?
3x + 7.50 = 22.50
x = $5
What is a coefficient?
number is used to multiply a variable
What is an inverse operation for multiplication
division
Z-24=14
Z=10
9 X H = 135
H = 15
Ike is selling his baseball cards at a yard sale. He is selling his cards for $3 each. At the end of the yard sale, he made $60. What equation would you use to solve for the number of cards AND how many cards did he sell?
3x = 60
x = 20
What is an inverse operation? give me an example
opposite. multiplication is division. addition becomes subtraction.
what an inverse operation for this equation
45=6 x r
division
94-E=47
E= 47
What is the one food that has been proven to never expire?
Honey
Ruby, Leilani, Clark, and Ari all go to a Kings game. They decide to split a $15 order of nachos, and two bags of spicy tater tots that are $7 each. How much does each person put in?
15 + 7(2) = 4x
15 + 14 = 4x
29 = 4x
29/4 = x
7.25 = x