In an essay about the history of printing, which structure would be the most for a younger audience? a. the event group under each key inventor b. the events listed in order from earliest to latest c. the key changes grouped together regardless of time d. the modern process step by step

D. The modern process step by step

Explanation:

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not concrete, existing in thought or as an idea but not having a physical or concrete existence

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4