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Please help me with my math

Please help me with my math-example-1

1 Answer

4 votes

Answer:

x = 13

Explanation:

are valid as opposite angles, therefore equal, we solve with an equation

4x + 18 = 7x - 21

18 + 21 = 7x - 4x

39 = 3x

x = 39 : 3

x = 13

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check

4 x 13 + 18 = 7 x 13 - 21

70 = 70

the answer is good

x = 13

User Sergei Kovalenko
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