Angles Equation

Tags

CCSS.8.G.A.5

Select the equation to represent the angle relationship in the image.

Tags

CCSS.7.G.B.5

Tags

CCSS.8.G.A.5

Tags

CCSS.8.G.A.5

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CCSS.HSG.SRT.B.4

How would you SET UP the equation to solve for x?

• x - 5 = x + 11

• x - 5 + x + 11 = 180

Answer explanation

These are supplementary angles. They are not equal. They add up to 180.

Tags

CCSS.7.G.B.5

x - 5 + x + 11 = 180

Combine like terms! What do you get?

• 2x + 6 = 180

• 2x + 16 = 180

Tags

CCSS.7.G.B.5

How would you SET UP your equation?

• 9x + 7 = 10x - 2

• 9x + 7 + 10x - 2 = 180

Answer explanation

These are vertical angles. They are congruent, so they are equal to each other. So when you set up the equation, you make set them equal to each other.

Tags

CCSS.7.G.B.5

Next step: Subtract 9x on both sides. What do you get?

• 7 = x - 2

• 7 = 19x - 2

• 7 = 10x - 2

• 7 = 9x - 2

Tags

CCSS.7.G.B.5

How would you SET UP your equation?

• 4x + 13 = 6x - 3

• 4x + 13 + 6x - 3 = 180

Tags

CCSS.8.G.A.5