Which sentence contains a dangling modifier? Whistling a happy tune, Marti walked slowly to school. While playing my electric guitar, the amplifier went dead. While I was watching my favorite TV show, the telephone rang. After studying late at night, Latise felt tired the next morning.

While playing my electric guitar, the amplifier went dead

Explanation:

The sentence that contains a dangling modifier is option B because

A dangling modifier is a word that modifies a word that is not clearly stated in the sentence. It usually does not have a subject and is most times a participle.

From the sentence, "While playing my electric guitar, the amplifier went dead", it does not clearly state what it is modifying, hence one can erroneously believe that the amplifier was playing the guitar which is irrational.

The sentence can be properly revised and rewritten so the word that is modified is clearly stated, ""While I was playing my electric guitar, the amplifier went dead".

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

the objective should be switched