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How do solve the following linear system?: $x + y = - 4, x - y = 2$ $x+y=-4, x-y=2$ ?

1 Answer

Jun 20, 2018

$x = - 1, y = - 3$ $x=-1, y=-3$

Explanation:

By adding the two equations together you eliminate the $y$ $y$ variable

$2 x = - 2$ $2x=-2$

$x = - 1$ $x=-1$

substitute $x = - 1$ $x=-1$ into $x + y = - 4$ $x+y=-4$

$- 1 + y = - 4$ $-1+y=-4$

$y = - 3$ $y=-3$

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