решите систему уравнений 5x-y=7 3x+2y=-1. Created by aznaurtatarov07. algebra-ru

решите систему уравнений 5x-y=7 3x+2y=-1...

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$\left \{ {{y = 5x - 7,} \atop {3x + 2(5x - 7) + 1 = 0}} \right.$
3x + 2(5x - 7) + 1 = 0
3x + 10x - 14 + 1 = 0
13x - 13 = 0
13x = 13
x = 1

$\left \{ {{x = 1} \atop {y = 5 - 7 = -2}} \right.$

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Lesben

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5x-y=7
3x+2y=-1
--------------------
y=5x-7
3x+2y=-1
---------------------
y=5x-7
3x+2(5x-7)=-1
------------------------------
y=5x-7
3x+10x-14=-1
----------------------------
y=5x-7
13x=-1+14
------------------------
y=5x-7
13x=13
-------------------
y=5x-7
x=1
------------------
y=5-7, y=-2
x=1
--------------------------
/x,y/=/1,-2/
=============

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aznaurtatarov07 спасибо

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