Solve by substitution: $x + y = 7$ and $x - y = 1$. Then $x$ equals

Solve by substitution: $x + y = 7$ and $x - y = 1$. Then $x$ equals
  1. $4$
  2. $3$
  3. $5$
  4. $2$

Solution

From first: $y = 7 - x$. Sub into second: $x - (7-x) = 1 \Rightarrow 2x = 8 \Rightarrow x = 4$.

Asked in: MH-SSC-9

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