Question

rezolvati sistemele de ecuatii : {3x-2y = 13
x+4y=-5
{x+2y=8
2x-y=1
{3x+2y=7
-x+4y=5
va rog frumos repede
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Answer 1

Explicație pas cu pas:

3x-2y=13 <=>3x-2y=13

x+4y=5| •3. 3x+12y=15 scadem relatiile si avem. 14y=2=>y=2/14=1/7,x=15/21=3/7

x+2y=8 |•2. 2x+4y=16. 4y-(-y)=15=>5y=15=>y=3,x=2

2x-y=1. <=>. 2x-y=1. scadem relatiile=>

3x+2y=7 |•-2. -6x-4y= -14

-x+4y=5 -x+4y= 5 aduni relatiile si calculezi x,y