Vocabulary
Expressions and equations are the same thing (True or false)
False
Write the expression: Add 4 to x
4+x
What is y + 2 when y=9?
11
Solve for x when 2x=8
x=4
How many packages of diapers can you buy with $40 if one package costs $8?
5 packages
A letter used to represent an unknown number is called a
Variable
Write the expression: Subtract 7 from x and then divide by 3
(x-7)/3
Evaluate the expression 5y + 5 when y = 9
50
Solve for p when 3p - 4 = 8
p=4
The beach is x miles away from home. Josh drove to and from the beach with a total distance of 36 miles. Find x.
18 miles
Is this an expression or equation?
2x2+y+2
Expression
Each basket contains 12 melons. If there are b baskets, how many melons are there in all?
12b
Evaluate the expression 10a - 2b +5 when a = 9, b=4
77
Solve for n when −6n − 2n = 16
n=-2
331 students went on a field trip. Six buses were filled and 7 students traveled in cars. How many students were in each bus?
331-7=324
324/6=54
54 students
If two expressions have the same value, the whole statement is an
Equation
Christian works for $50 a day and additional $6 per hour for overtime. If he works t hours overtime in a day, how much money will he receive?
50+6t
Evaluate the expression 3x2+2y-8 when x=2, y = 9
22
Solve for p when 2p + 6 = 4p - 10
At a parade, there are m women and 3 times as many men as women. There are 6,352 fewer children than men. a. Find the number of men and the number of children in terms of m. b. If m = 7,145, how many total people (men, women, and children) are at the parade?
a. men: 3m children: 3m - 6,352
b. 43,663
To find the value of the variable that will make an equation true is to _____________ the equation.
Solve
If the width of a rectangle is 7 centimeters shorter than three times its length (l), how wide is its width?
3l-7
Evaluate the expression (7/3)a + (3/4)b when a=9, b=12
30
−13 = 5(1 + 4m) − 2m
-13=5+20m-2m
18m=-13-5
18m=-18
m=-1
Andy has 3r - 3 baseball cards. Micah has 2r + 5 baseball cards. a. If r = 14, who has more cards? (Andy or Micah?) b. For what value of r will the two boys have the same number of cards? (Hint: set the expression for Andy and the Micah equal to each other and solve for r)
a. Andy
b. When r = 8 the two boys will have the same number of cards