Question

3x + 4y= 16 solve for y

Answer 1

   3x + 4y = 16
- 3x             -3x 
          4y = -3x + 16     (divide each side by 4)
         $\frac{4y}{4} = \frac{-3x+16}{4}$
          y = -3/4x + 16/4
  
The answer is  $y =- \frac{3}{4}x +4$