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8-61.
  1. Write an equation that represents each diagram below and find the value of the variable. Homework Help ✎

How are the two lines related?
How will this help you write an equation?

Because the two lines are equal, you can write the equation:
x + x + 10 = 24

Combine like terms
2x + 10 = 24

Then solve for x:
2x = 14
x = 7

x = 7

Use the same method as part (a).