Define Variable Expression

Define variable

• a letter in the alphabet

• a letter or symbol standing for an unknown value

• a letter to grandma

• a letter to Santa

Name the variable in the following number sentence:
2x -7 = 9

• x

• 2

• 7

• 2x-7

What are the variables in the following expression: 3z + 4x - 1 + 7y

• 3, 4, 1 and 7

• z, x and y

• + and -

• 15

Identify the variables in the expression
3x +  9

• x

• y

• 9

• 3x

Write an expression using a variable to represent the expression

Eleven decreased by k ​ (a)  

• k-11

• k/11

• 11-k

• k+11

a symbol for an unknown value; usually a letter (such as a, x, or y) is the symbol used

• constant

• variable

• coefficient

• term

The product of 5 and f

• 5 + f

• 5 - f

• 5f

• 5/f

Valerie has 'x' dollars. She spends $4 on lunch, but then she finds a $5 bill on the ground. Write a mathematical statement to express how many dollars Valerie has now.

• x-4+5

• 4x5+x

• 5-4-x

• x-4-5

A letter that represents a number is called a _____.

• variable

• coefficient

• constant

• term

a symbol for an unknown value

• term

• operator

• variable

• coefficient