How do solve the following linear system?: $2x +5y - 21 = 0 , 3x – 2y = 7$ ?

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Answer 1 · 2016-02-27T09:53:04

$2x+5y-21=0-------(1)$
$3x-2y-7=0-------(2)$
By cross multiplication we have
$x/(5*(-7)-(-2)*(-21))=y/(-21*3-(-7)*2)$

$=1/(2*(-2)-5*3)$

$=>x=77/19$

$=>y=49/19$

How do solve the following linear system?: 2x +5y - 21 = 0 , 3x – 2y = 7 2x +5y - 21 = 0 , 3x – 2y = 7 ?