Is it allowed to use someone Else lyrics/sounds or parts of someones Else lyrics/sound in «your» pen music, why, why not ?

No, unless they give you permission this is copyright and you can be sued for it.

Explanation:

first of all wood chucks don't "chuck" wood. none, and for the fun of the answer the amount of wood chucked would be a lot!

explanation:

a wood chuck is a ground hog, it belongs to the family of large underground squirrels. it belongs to the family of marmots. ground hogs eat grasses, berry's, and other vegetation.

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