Part 1: What are variables, expressions, and equations? | Introduction to algebra | Algebra I | Khan Academy

What is a variable?

• Values in an expression that can change

• shortened words

• constant values

Tags

CCSS.6.EE.A.2B

What is an expression in math?

• Something that has a variable in it.

• When you connect statements in math with an equals sign.

• A mathematical statement of some value

Tags

CCSS.6.EE.A.2B

Values of expressions change depending on the value of the...

• variables in the expression.

• Constants in the expressions.

• Coefficients in the expressions.

• Equations in the expressions.

Tags

CCSS.6.EE.A.2C

Equations set two______equal to each other.

• Expressions

• Variables

• Coefficients

• Properties

Select all of the expressions in the following equation:

• x+y+z

• 5

• x

• x+y+z=5

Tags

CCSS.6.EE.A.2B

For the equation x+y+z=5, if y=3 and z=2, what is the value of x?

• 2

• 4

• 3

• 0

• 1

Tags

CCSS.6.EE.B.7

Which of the following can have different values depending on the context of a problem?

• all of a, b, and c.

• expressions

• variables

• both a and c.

• constants

Tags

CCSS.6.EE.B.6

Evaluate the expression a-10 when a=20.

• -10

• 10

• 15

• 5

Tags

CCSS.6.EE.A.2C

Evaluate the expression a-10 when a=5.

• 5

• 10

• -10

• -5

Tags

CCSS.6.EE.A.2C

USE PQPA to respond to the following prompt:

What is the difference between an expression and an equation?

Tags

CCSS.HSA.REI.A.1