I need help with this question

Pls! does anybody know a shortcut for answering these types of questions in the future?

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days