Parts of an Expression
In 5x + 8, what is the variable?
x
Write an expression for a number plus 6.
x + 6
Evaluate x + 5 when x=3
3 + 5 = 8
Simplify: 3x + 4x
7x
True or false: 3x and 3 are like terms. Explain.
False, they do not have the same variable
In 7m - 4, what is the coefficient of m?
7
Write an expression for four times a number.
4x
Evaluate 4x when x=6
4(6) = 24
Simplify 8x - 5x + 2
3x + 2
Fill in the blank: 4x = ___x = 9x
5
In 3x - 9, what is the constant term?
-9
Write an expression for a number divided by 5.
x/5
Evaluate 2x + 7 when x=5
2(5) + 7 = 17
Simplify 4x + 6 + 3x - 2
7x + 4
A student says 5x + 2 = 7x. Explain the mistake.
5x and 2 are not like terms. The expression stays 5x + 2.
How many terms are in the expression 6x - 3 + 2y? Name them.
3; 6x, -3, 2y
Write an expression for seven less than a number.
x - 7
Evaluate 3x - 4 when x = -2
3(-2) - 4 = -10
Simplify - 5x + 3 + 2x - 8
- 3x - 5
A student evaluates 2x + 3 when x=4 and gets 14. Are they correct?
No
2(4) + 3
8 + 3 = 11
In -x + 5y - 8, identify BOTH coefficients AND the constant term.
coefficients: -1, 5; constant: -8
Write an expression for 3 more than twice a number
2x + 3
Evaluate 2x + 3y when x = -4 and y = 5
2(-4) + 3(5)
-8 + 15 = 7
Simplify 6x - 4y - 9x + y + 5
- 3x - 3y + 5
A student simplifies 7x - 3 + 2x - 5 to 9x + 2. Are they correct?
No
7x + 2x = 9x
-3 - 5 + 2 = -6
Correct answer: 9x - 6