The video tutorial explains how equations can have one solution, using a pan balance as a metaphor. It introduces variables as symbols representing unknown numbers and clarifies the common misunderstanding of the equal sign. Through examples, it demonstrates how both sides of an equation must be balanced. A real-world problem involving the cost of jeans is solved using substitution to find the correct solution, emphasizing that an equation can only have one solution.

What is the main concept introduced in the lesson about equations?

• Equations can have multiple solutions.

• Equations can have one solution.

• Equations are only used in mathematics.

• Equations are always unbalanced.

What does a variable represent in an equation?

• A mathematical operation

• A fixed value

• A letter or symbol representing an unknown number

• A known number

What is a common misunderstanding about the equal sign?

• It means both sides have the same value.

• It is used only in addition.

• It indicates subtraction.

• It means the answer is.

In the example 9 minus 2 equals 7, what does the pan balance metaphor illustrate?

• The equation is unbalanced.

• Both sides have different values.

• Both sides have the same value.

• The equation is incorrect.

How can you think of equations to solve for unknowns?

• As statements

• As questions

• As solutions

• As answers

In the real-world problem, what is the equation used to find the cost of the jeans?

• 22 plus 68 equals 90

• 22 plus square equals 90

• 22 plus 66 equals 90

• 22 plus 72 equals 90

What method is used to find the solution for the cost of the jeans?

• Graphing

• Substitution

• Trial and error

• Elimination

Why is $68 the correct solution for the cost of the jeans?

• Because it is the lowest value

• Because it is the highest value

• Because it balances the equation

• Because it is the only option given

What happens if an equation is not balanced?

• It has no solution.

• It has multiple solutions.

• It cannot be solved.

• It is incorrect.

Can an equation have more than one solution?

• No, it can only have one solution

• Yes, if it is a complex equation

• Yes, if it is unbalanced

• Yes, always