i need help. y-12=4y

Question

i miss the day at school that they explained this and i don't understand please help.

Answer 1

Hi, Xeo.

 

Okay, so you need to isolate the variable.

 

y - 12 = 4y

 

You want to solve for y so,

 

y - 12 - y = 4y - y     (Subtract y from both sides)

-12 = 3y

 

Now, divide both sides by 3:

 

-12/3 = 3/3 y

-4 = y