Inverse Operation
What inverse operation should you use to isolate x?
5x = 20
Divide both sides by 5
x = 4
What's your first step? (Hint: Reverse BEDMAS)
9x + 5 = 14
Minus 5 on both sides
4x + 2 = 34
x = 8
3x + 8 = 14
x = 2
What is a variable?
a symbol (usually a letter) standing in for an unknown numerical value in an equation
What inverse operation should you use to isolate x?
x - 8 = 3
Add 8 on both sides
x = 11
What's your first step? (Hint: Reverse BEDMAS)
x ÷ 9 + 13 = 20
–13 on both sides
2x - 20 = 40
x = 30
9x - 5 = 13
x = 2
What operation is the inverse of division?
Multiplication
What inverse operation should you use to isolate x?
4x = 24
Divide by 4 on both sides
x = 6
What's your first step? (Hint: Reverse BEDMAS)
8x + 3 = 43
–3 on both sides
x ÷ 3 + 2 = 9
x = 21
x ÷ 2 – 5 = 25
x = 60
What is the inverse operation for multiplication?
Division
What inverse operation should you use to isolate x?
x÷3 = 4
Multiply by 3 on both sides
x = 12
What's your first step? (Hint: Reverse BEDMAS)
x ÷ 6 + 12 = 42
–12 on both sides
6x – 1 = 17
x = 3
g ÷ 5 + 3 = 13
g = 50
What's the difference between an expression and an equation?
An expression is just one side of an equation (the = sign).
An equation always has an equal sign and shows both sides are equal
What inverse operation should you use to isolate x?
x÷4 = 5
Multiply both sides by 4
x = 20
What's your first step? (Hint: Reverse BEDMAS)
16 + 7x = 79
–16 on both sides
9x + 5 = 32
x = 3
3x + 4 = 37
x = 11
Evaluate the expression.
5 x 3 + 2 =
17