Using supplementary angles to solve for the missing variable ex 19

The video tutorial demonstrates how to solve for the variable X in a linear equation by using the concept of supplementary angles. It explains that angles forming a straight line add up to 180 degrees, allowing the setup of an equation. The tutorial then shows how to combine like terms and solve the equation to find the value of X.

What is the sum of angles that form a straight line?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

Which of the following equations represents the sum of supplementary angles?

• X + 3X + X - 20 = 360

• X + 3X + X - 20 = 270

• X + 3X + X - 20 = 180

• X + 3X + X - 20 = 90

How do you simplify the expression X + 3X + X?

• 3X

• 6X

• 5X

• 4X

What is the value of X when you solve the equation 4X - 20 = 180?

• 45

• 40

• 50

• 55

What operation is performed after combining like terms in the equation 4X - 20 = 180?

• Subtract 20 from both sides

• Multiply both sides by 4

• Add 20 to both sides

• Divide both sides by 4