How do you solve the following system: $5 x + y = - 7, 5 x - 9 y = - 23$ $5x+y=-7 , 5x-9y=-23$ ?

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Answer 1 · 2016-04-01T21:49:03

$x = - 1, 72$ $x=-1,72$
$y = 1, 6$ $y=1,6$

$5 x + y = - 7 5 x = - 7 - y (1)$ $5x+y=-7" "color(red)(5x)=color(green)(-7-y)" "(1)$

$5 x - 9 y = - 23 5 x = - 23 + 9 y$ $5x-9y=-23" "color(red)(5x)=color(green)(-23+9y)$

$if color(red)(5x=5x) " then "color(green)(-7-y=-23+9y)$

$-7+23=9y+y$

$16=10y$

$y=1,6$

$"use equation (1)"$

$5x=-7-1,6$

$5x=-8,6$

$x=-(8,6)/5$

$x=-1,72$

How do you solve the following system: 5x+y=-7 , 5x-9y=-23 5x+y=−7,5x−9y=−23 5x+y=-7 , 5x-9y=-23 ?