Which action is an example of plagiarism?
a. forgetting to create a title for an original story
b. failing to cite references for a research paper
c. neglecting appropriate punctuation in an essay
d. ignoring grammatical rules on a writing test

The answer is B: failing to cite references for a research paper.

Plagiarism is a form of literary theft or fraud in which a writer passes someone else´s words or ideas as his or her own without giving due credit to the actual author of the words or ideas that are being referenced and expressed in the text. This form of theft or fraud is commonly associated with academic texts, for which there are guidelines or formatting styles (such as APA or MLA) to abide by.  

no

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