Which ordered pair is the solution to the system?

{x+3y=6
{4x+6y=−6

(−9, 5)
(−3, 3)
(12, −2)
(6, 3)

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

Aweekly newspaper charges $72 for each inch in length and one column width. what is the cost of an ad that runs 2 column inches long and 2 columns wide? its not 288