Question

{2x+3y=1, 2x-5y=9. ,

Answer 1

2x+3y=1        2x-5y=9

Din prima scadem a 2-a

2x+3e-(2x-5y)=1-9    =>       2x+3y-2x+5y=(-8)    =>   8y=(-8)   =>  y=(-1)

Inlocuim in prima ecuatie:

2x+3·(-1)=1    =>    2x-3=1  =>  2x=4  => x=4:2=2

                                                  R-s:         x=2 ,   y=(-1).

Answer 2

2x+3y=1   
2x-5y=9/*(-1)

2x+3y=1
-2x+5y=-9

8y=-8/:8
y=-1

2x+3*(-1)=1
2x-3=1
2x=1+3
2x=4/:2
x=2

Sper ca te am ajutat!!!