1/3 of the result of 3 times in number that is increased by 12

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

Jacob is graphing the line represented by the equation  −6x−5y=12.−6x−5y=12.  he first plots the  x-x-  and  y-interceptsy-intercepts  as follows.    which statement is correct regarding the intercepts on the graph?

Sole the equation 6n + 9 = -3n - 21 - 6 for n