Writing Expressions
The product of 7 and a number.
7x
Evaluate 2 + x
where x = 5
7
8x + 2x
10x
Are these two expressions equivalent to each other? Yes or no.
6 + x + 7 = x + 13
Yes.
How many terms?
5x + 2y - 8
3
Six times a number minus 8
6x - 8
Evaluate 3x + 1
where x = 4
13
Simplify by Combining Like Terms
10x + 2 + 2x
12x + 2
Are these two expressions equivalent to each other? Yes or no.
X2 = x + x
No.
For them to be equivalent:
x2 = x * x
OR
2x = x + x
What is the coefficient?
8 - x
Three less than five times a number
5x - 3
Evaluate if y = 5
y^2 - 6
19
Simplify by combining like terms
3y + 4 - y + 2
2y + 6
Are these two expressions equivalent to each other? Yes or no.
20x + 5 = 10x + 10x + 6 - 1
What is the constant?
9y - 2x - 7
-7
Twice a number cubed
2x^3
Evaluate if a= 2 and b= 4
5a + 2b - 6
12
Simplify by combining like terms
5 + 2a - 4 + 3a
5a - 1
Are these two expressions equivalent to each other? Yes or no.
1x - 2y = 4x - 2y - 1x - 2x
Yes.
What are the variables?
-6x + 5y - 4
x and y
Three times the difference of x and 9
3(x-9)
Evaluate if x = 8 and y = 2
2x + 3y^2 - 9
19
Simplify by combining like terms
2x + 4 + 2x - 4
4x
Are these two expressions equivalent to each other? Yes or no.
x (y + z) = xy + xz
Yes (distributive property).
What is the coefficient?
-8x + 4
-8