ONE-STEP EQUATIONS
Solve:
x + 7 = 15
x=8
2x + 3 = 15
x=6
What do you call a number multiplied by a variable?
Coefficient
x + 5 = 12 → x = 17
What is the error?
They added instead of subtracting. x = 7
Which is equivalent to 4(x + 1)?
4x + 4
Solve:
x – 9 = 4
x=13
4x – 5 = 19
x=6
What is a mathematical sentence that uses an equals sign?
Equation
3x = 18 → x = 3
What is the error?
They divided by 3 wrong; x = 6
Combine like terms:
5x + 3x
what is 8x
Solve:
5x = 45
x=9
3x + 4 = 10
x=2
What is a value that makes an equation true?
Solution
2x – 4 = 10 → 2x = 6 → x = 6
What is the error?
Added incorrectly; correct x = 7
2(3x – 4)
6x – 8
Solve:
x ÷ 6 = 7
x=42
5(x – 2) = 25
X=7
Two expressions that have the same value are called what?
Equivalent expressions
4(x + 2) = 4x + 2
What’s the error?
Didn’t distribute correctly; should be 4x + 8
7x + 2x + 5?
9x + 5
Solve:
–12 = x – 20
x=8
3x + 8 = –10
x = –6
What do we call a number without a variable?
Constant
3x + 4y =7xy
Error
Cannot combine unlike terms. Correct: 3x + 4y
3(x – 2) + 2x
5x – 6