Vocab
👉 What is a variable?
A letter that represents an unknown number
Solve: x + 5 = 12
x = 7v
Solve: 2x + 4 = 10
x = 3
A number plus 6 equals 15. What is the number?
x = 9
Solve: 2x + 5 = x + 12
x = 7
What is a coefficient?
The number multiplied by a variable
Solve: x - 9 = 3
x = 12
Solve: 3x - 5 = 16
x = 7
4 times a number equals 28. What is the number?
x = 7
Solve: 3(x + 2) = 18
x = 4
What is an equation?
A math sentence with an equals sign
Solve: 4x = 20
x = 5
Solve: 5x + 2 = 27
x = 5
A number minus 3 equals 11. What is the number?
x = 14
Solve: 4x - 7 = 2x + 9
x = 8
What does “inverse operation” mean?
The opposite operation (ex: addition & subtraction)
Solve: x Ă· 6 = 8
x = 48
Solve: 4x - 8 = 0
x = 2
A number divided by 5 equals 6. What is the number?
x = 30
Solve: -2(x - 3) = 10
x = -2
What does it mean to “solve” an equation?
Find the value of the variable
Solve: -3x = 15
x = -5
Solve: 6x + 3 = 45
x = 7
3 times a number plus 2 equals 20. What is the number?
x = 6
A number multiplied by 5, then decreased by 7, equals 18. What is the number?
(Write and solve the equation)
5x - 7 = 18 → x = 5