Discussion
If x + 5y = 16 and x= -3y, then y =
Answer: C
Substitute \( x = -3y \) into the first equation.
\[ -3y + 5y = 16 \quad\Longrightarrow\quad 2y = 16 \]
\[ y = 8 \]
Checking: \( x = -24 \), and \( -24 + 40 = 16 \). The \( -24 \) on offer is the value of \( x \), not \( y \).
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