Vocabulary
the name for the unknown number that is represented with a letter
variable
2x + 5x =
3x + 9 = 30
x = 7
Linda was selling tickets for the school play. She sold 10 more adult tickets than children tickets and she sold twice as many senior tickets as children tickets.
Write an algebraic equation.
(x + 10) + (2x)
Solve:
15 + c = 2c - 5
20 = c
the name for a number whose value will always remain the same (no variable)
constant
2x - 5x
-3x
4(2x-5) = 60
x = 10
Christa is saving for a new tablet. It costs $70 including tax. She has already saved $35. How much more does she need to save?
x + 35 = 70
8b + 2 = 10b
1 = b
the number in front of a variable in a variable term
EX: 5x (what is the 5 called?)
co-efficient
2x·5x
10x2
x/3 + 5 = 20
x = 5
Bella bought packs of stickers to give to her friends. Each pack cost $4. She spent a total of $12 on stickers. How many packs did she buy?
4x = 12
5a - 12 + 9a + 12
-6 = a
Numbers, symbols and operations (such as + and ×) grouped together that represent the value of something
expression
x3·x5
x8
3x + 10 = 2x
x = 5
The sum of 42 and twice a number is 164
42 + 2x = 164
5d - 3d + 25 = 5 - 3d
d = -4
A mathematical expression that shows the value of the expression using an equal sign
equation
(x3)4
x12
Teacher CHOICE
Algebra
Lilly currently has $80. If she saves $12.50 per week, how long will it take her to have $780?
80 + 12.50w = 780
-15 + 2x +2 -3 = 6x +4
Algebra