Solving For x
Solve for x: x + 7 = 10
x = 3
TRUE or FALSE: A·B = AB = A × B
TRUE
Name the property: a + b = b + a
commutative
Solve: y – 9 = 1
x= 10
Is “3x + 4” an expression or an equation?
expression
Solve for x: 3x = 27
x = 9
What do parentheses mean? Example: 3(4)
multiplication
Name the property: (x + 3) + 5 = x + (3 + 5)
associative
Solve: 4y + 8 = 20
y = 3
Is “2x + 1 = 9” an expression or an equation?
equation
Solve for x: 2x – 8 = 20
x = 14
The exponent in 2⁵ means what?
multiply 2 by itself 5 times
Name the property: x(1) = x
identity
Solve: 3(x – 5) + 4 = 13
x = 6
Which one has a solution? Expression or equation?
equation
Solve for x: 5(x – 2) = 30
x = 8
What symbol means “divide”? ÷ or / ?
BOTH
Name the property: x + (–x) = 0
inverse
Solve: yx – 9 = 1 for x, solve for x
X = 10/y
TRUE or FALSE: You can check an equation by substitution.
TRUE
Solve for x: 4x + 3 = 5x – 9
x = 12
Which is correct to represent “4 times x”: 4x or x4?
4x (we never put number on right)
Name the property used to simplify: 3(2x + 4) = 6x + 12
distributive
Solve: 3(x – 5) + 4 = 13
x=6
Which is a solution to 2x + 1 = 13
x=6