Solving Subtraction Equations Using Inverse Operations

The video tutorial explains how to solve a simple subtraction equation using a real-life example. Tiffany buys a bag of pretzels, eats five, and has 12 left. The equation X - 5 = 12 is used to find the original number of pretzels. The tutorial demonstrates isolating the variable X by adding 5 to both sides, resulting in X = 17. The solution is verified by substituting back into the equation. The lesson concludes with a recap of solving one-step subtraction equations.

What equation represents the number of pretzels Tiffany originally had?

• X = 12 + 5

• X - 5 = 12

• X + 5 = 12

• X = 5 - 12

What is the first step in solving the equation X - 5 = 12?

• Divide both sides by 5

• Add 5 to both sides

• Subtract 12 from both sides

• Multiply both sides by 5

Why do we add 5 to both sides of the equation X - 5 = 12?

• To isolate the variable X

• To balance the equation

• To make the equation more complex

• To eliminate the variable X

What is the solution to the equation X - 5 = 12?

• X = 7

• X = 17

• X = 12

• X = 5

How can we verify that the solution X = 17 is correct?

• By checking if 17 - 5 equals 12

• By adding 17 and 5

• By subtracting 17 from 12

• By dividing 17 by 5