Question

13. Express y in terms of x: 3x + y – 12 = 0​

Answer 1

$\rm 3x + y - 12=0$

Transferring -12 to RHS will make it positive.

$\rm\dashrightarrow 3x + y = 12$

Transferring 3x to RHS will make it negative.

Thus,

$\rm\dashrightarrow y = 12 - 3x$

Hence, expressed.