Starting equation: 
1 3 
y + 
1 4 
x = 1 
Multiply both sides by (4)(3) = 12:
(4)(3) 
1 3 
y +  (4)(3) 
1 4 
x = (4)(3)1 
Subtract 4y from both sides:
4y + 3x  4y = 12  4y
3x = 12  4y
Finally, divide both sides by 3:
3x 3 
= 
12  4y 3 
