What is the difference between “Why” and “How”?? My teacher said something about that and I came up with this question and now I need to know!!! Could anyone help with my curiosity? XD

Porque es una conjunción causal, equivalente 'ya que' o 'para que'. Porqué es un sustantivo, sinónimo de 'causa' o 'motivo'. Por qué se emplea para introducir oraciones interrogativas y exclamativas.

Explanation:

.

Since it is a causal conjunction, it is similar to 'since' or 'so that'. That is why it is used to introduce interrogative and exclamatory sentences.

Explanation:

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

your awnser would be b.