How do you find the solution of the system of equations $x + 3y = 19$ and $x - y = -1$ ?

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Answer 1 · 2018-04-04T04:05:39

$x=4$
$y=5$

$x+3y=19$ --- (1)
$x-y=-1$ --- (2)

(1) - (2)

$4y=20$
$y=5$ --- (3)

Sub (3) into (2)

$x-5=-1$
$x=4$

How do you find the solution of the system of equations x + 3y = 19 x + 3y = 19 and x - y = -1 x - y = -1 ?