What sound do the following words have in common?
emergency clever Teresa

The sound of 'er' is common in them.

Explanation:

The sound that one can find common in all of the  examples is the insistence on the sound of the letter 'e' as it is used int he same way in the three letters that is how it is used to as a vowel.

This makes the three words seem connected in a sort of alliteration due to the repeat of  the sound of the vowels that constitute the words.

This also leads to some reliance upon the word or sound of 'er' which can also be evidently seen here that is there in all three of the words given.

she is later raised by him and his wife, madame valmonde, who sees her as gift from god, as the couple cannot have their own children. later, desiree falls in love with a wealthy man, armand aubigny, and they get married.

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