Solve the system by the addition method.
-$x + y = - 1$ $x - y = 14$
A) $\{ ( 6.5 , - 7.5 ) \}$
B) $\{ ( 6.5,7.5 ) \}$
C) $\{ ( 1 , - 7.5 ) \}$
D) $\{ ( 1,6.5 ) \}$

Question

Quizplus · Accepted Answer

Adding the two equations $x + y = -1$ and $x - y = 14$ directly gives $2x = 13$, solving for $x$ gives $x = 6.5$. Substituting $x = 6.5$ into the first equation gives $y = -7.5$, so the solution is $\{ ( 6.5 , - 7.5 ) \}$.

Solve the System by the Addition Method x+y=−1x + y = - 1x+y=−1

Solve the System by the Addition Method $x + y = - 1$