Question

5x+2y=15, 8x+3y=204;

Answer 1

x=(15-2y)/5
8(15-2y)/5+3y= 204
120-1y-1020=0
y=-900
x=(15-1800)/5 думаю досчитаешь

Answer 2

5x+2y=15

8x+3y=204

 

5x+2y=15

y=-2.5x+7.5

 

8x+3y=204

8x+3*(-2.5x+7.5)=204

8x-7.5x+22.5-204=0

0.5x-181.5=0

x=181.5/0.5

x=363

 

5x+2y=15

5*363+2y=15

1800+2y=0

y=-1800/2

y=-900