Question

Rezolvati Sistemul

x+2y=3
3x-y=5*

Answer 1

x+ 2y=3

3x-y=5 amplificam cu 2 toata ecuatia

x+2y=3

6x-2y= 10

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7x       =13 => x= 13/7

13/7+2y=3 => 2y= 3-13/7 amplficam pe 3 cu 7

2y =8/7 => y= 8/7 * 1/2 = y= 8/14 = 4/7

Answer 2

Explicație pas cu pas:

x+2y=3⇒x=3-2y⇒x=3-8/7⇒x=13/7

3x-y=5⇒3(3-2y)-y=5⇒7y=4⇒y=4/7

Raspuns : (x,y)=(13/7,4/7)

Bafta!