Devon's teacher requires that students show each step in solving a problem. Devon wrote the following when solving the equation x - 7 = 20:

x - 7 = 20

x - 7 = 20 + 7

x = 27

The teacher said that Devon's work was not shown correctly. Why?

A) Devon's final answer should be 13

B) Devon should have shown that he added 7 to both sides

C) Devon should have shown that he subtracted 7 from both sides

D) Devon should have shown that he added 7 to the left side only

Question

12 January, 08:52

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Answers (1)

Know the Answer?

Singleton · Answer 1

B) Devon should have shown that he added 7 to both sides

Step-by-step explanation:

x-7 = 20

add 7 to each side

x-7+7 = 20+7 NOT x-7 = 20+7

x=27