Given: 3x + y = 1 ... Solve for y ... y = - 3x + 1. y = - 3x - 1. y = 3x - 1

3x + y = 1

Subtract 3x from each side to find y, as follows:

y = - 3x + 1

The first choice is correct.

The answer to the question given 3x + y = 1, to solve for y in the other given y=-3x + 1, y = - 3x - 1 and y = 3x - 1. This is the following steps for the equation:

Step 1: add both sides with - 3x to get 3x - 3x + y = 1 - 3x. the (3x - 3x) is equals to zero getting the equation of y = 1-3x.