Variables and Coefficients

The video tutorial explains the concept of variables and coefficients in mathematics, using examples like 5x and 7a + 4. It demonstrates how to evaluate expressions by substituting values for variables and performing arithmetic operations. The tutorial also distinguishes between coefficients and constants, emphasizing the order of operations in expressions. By the end, viewers learn to evaluate terms and expressions for given variable values.

What is a variable in mathematics?

• A mathematical operation

• A symbol representing an unknown value

• A constant value

• A number that multiplies another number

In the term 5x, what is the role of the number 5?

• It is a constant

• It is an exponent

• It is a variable

• It is a coefficient

How do you evaluate the expression 5x when x equals 3?

• Divide 5 by 3

• Subtract 3 from 5

• Multiply 5 by 3

• Add 5 and 3

In the expression 7a + 4, what is the term 4 called?

• A constant

• A coefficient

• An exponent

• A variable

What is the value of the expression 7a + 4 when a equals 2?

• 18

• 20

• 16

• 14