If y/x = 1/3 and x + 2y = 10, then x is 1. 2 2. 3 3. 4 4. 6
Since y/x = 1/3, cross multiply to obtain x = 3y. Substitute x = 3y into x + 2y = 10 to get 3y + 2y = 5y = 10. Therefore y = 2, so x = 6. You can check that 2/6 = 1/ and 6+2(2)=10, so you know your answer is correct.