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**Finding angles with algebraic expressions**

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**You need to take the concepts that we have learned to find the value of x**

5x x + 20

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**What do we know about these angles**

5x x + 20

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**What do we know about these angles They add up to 180**

5x x + 20

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**Set the two equations so they add up to 180**

5x x + 20 = Now solve for x 6x + 60 = 180 6x = 120 X = 20 5x x + 20

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**What do you know about these angles**

5x x + 70

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**What do you know about these angles They are equal to each other**

5x x + 70

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**Set the equations equal to each other and solve for x**

5x + 10 = 2x + 70 -2x 3x + 10 = 70 - 10 3x = 60 X = 20 5x x + 70

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Find x 2x x+ 30

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Find x 10x + 10 3x + 59

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