Find the value of x using supplementary angles

The video tutorial explains how to find the value of X in a geometry problem involving a triangle and supplementary angles. It begins by identifying the given information and the need to use supplementary angles, which add up to 180 degrees. The instructor sets up an equation using the given angles and solves it step-by-step to find the value of X, which is 21.

What is the sum of angles in a triangle?

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

What do supplementary angles add up to?

• 90 degrees

• 360 degrees

• 180 degrees

• 270 degrees

If angle A is 6X + 2 and angle B is 2X + 10, what is the equation to find X if they are supplementary?

• 6X + 2 + 2X + 10 = 90

• 6X + 2 + 2X + 10 = 180

• 6X + 2 + 2X + 10 = 360

• 6X + 2 + 2X + 10 = 270

What is the first step in solving the equation 8X + 12 = 180?

• Multiply both sides by 8

• Subtract 12 from both sides

• Add 12 to both sides

• Divide both sides by 8

What is the value of X after solving the equation 8X = 168?

• 22

• 23

• 21

• 20