Which would be the best way for edna to make her speech more persuasive to her audience?

Well there are no selections listed but if she wants to make a persuasive speech, she has to get know the type of people her audience is.  This way she will know what to say and how to say it to gain their support.

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explanation:

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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