Vocabulary
Define variable
an unknown value that is represented by a letter; usually represented by x and y
Give an example of a constant
12
10 + x = 14
x = 4
$20
2x =
If x = 8
16
Define constant
a number by itself
12 or 12x or 12-x
T - 12 = 6
Molly had some crayons. She gave her sister 8. Now she has 16. How many did she start with?
16x =
If x = 2
32
Define an equation
What is both sides are equal?
Give an example of a variable
x, y, or z
3x = 15
x = 5
I go to the store and buy 3 apples for .50 each. How much did I spend on apples?
$1.50
4x - 2 =
If x = 3
10
Define coefficient
Define an operation
What is addition, subtraction, multiplication, or division?
2x = 4
x = 2
Sally buys 5 cupcakes and spends $15. How much was each cupcake?
$3
x + y =
If x = 1
y = 7
8
Define solution
What is a value, or values, that can be put in place of a variable, that makes an equation equal?
Define expression
can be a single number, a number and variable, or an expression containing an operator
3+x = 20
x = 17
Jim goes to the store to buy 7 boxes of crackers. Each box costs $4. How much does he spend in all?
$28
2x + 3 =
If x = 1
5