Evaluating Expressions with Variables

The video tutorial demonstrates how to evaluate algebraic expressions by substituting given values for variables. It covers two examples: evaluating 5x + 7y when x = 0 and y = 9, and evaluating -2x + 4y when x = -5 and y = -3. The process involves substituting the values, performing multiplication, and using the order of operations to simplify the expressions to their final values.

What is the result of the expression 5x + 7y when x = 0 and y = 9?

• 54

• 45

• 63

• 72

In the expression 5x + 7y, what does 5x represent when x = 0?

• 9

• 45

• 0

• 5

How do you evaluate the expression -2x + 4y when x = -5 and y = -3?

• Substitute x and y, then add

• Substitute x and y, then multiply

• Substitute x and y, then subtract

• Substitute x and y, then divide

What is the result of -2x + 4y when x = -5 and y = -3?

• -12

• 12

• 10

• -2

In the expression -2x + 4y, what is the result of -2 * -5?

• 0

• 5

• 10

• -10

What is the final result of adding 10 and -12 in the expression -2x + 4y?

• -2

• 2

• 0

• 12