Solve $x + y = 5,\ 2x + 3y = 12$. $y$ equals

Solve $x + y = 5,\ 2x + 3y = 12$. $y$ equals
  1. $2$
  2. $3$
  3. $5$
  4. $1$

Solution

From first: $x = 5 - y$. Sub: $2(5-y) + 3y = 12 \Rightarrow 10 + y = 12 \Rightarrow y = 2$.

Asked in: MH-SSC-9

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