Evaluating Expressions with Two Variables

The video tutorial explains how to evaluate mathematical expressions with variables. It starts with a simple expression involving two variables, a and b, and demonstrates how to substitute values to find the result. The tutorial then progresses to a more complex expression with variables x and y, showing step-by-step substitution and simplification to reach the final answer. The video encourages viewers to pause and try solving the expressions independently, reinforcing the learning process.

What is the value of the expression a + b when a = 7 and b = 2?

• 10

• 11

• 9

• 8

If a = 7 and b = 2, what is the result of replacing a and b in the expression a + b?

• 6 + 2

• 7 + 2

• 7 + 3

• 8 + 2

What is the first step in evaluating the expression x * y - y + 3 * x when x = 3 and y = 2?

• Replace x with 3

• Replace x with 2

• Replace y with 1

• Replace y with 3

In the expression x * y - y + 3 * x, what is the value of 3 * y when y = 2?

• 8

• 6

• 5

• 7

What is the result of 3 * 2 in the expression x * y - y + 3 * x when x = 3 and y = 2?

• 5

• 6

• 8

• 7

What is the value of 3 * 3 in the expression x * y - y + 3 * x when x = 3?

• 8

• 9

• 6

• 7

What is the final value of the expression x * y - y + 3 * x when x = 3 and y = 2?

• 14

• 13

• 12

• 11

What is the result of 6 - 2 + 9 in the expression x * y - y + 3 * x when x = 3 and y = 2?

• 12

• 13

• 14

• 15