Question #N587
If $x + 3y = 10$ and $x = 2y$, what is the value of $y$?
A. 1
B. 2
C. 3
D. 4
Correct Answer is: B
Substitute $2y$ for $x$ in the first equation: $2y + 3y = 10$. Combine like terms: $5y = 10$. Divide both sides by 5 to get $y = 2$.