Odpowiedź :
6/x=5/y
x+y=7
-5x+6y=0
x+y=7 |·5
-5x+6y=0
5x+5y=35
+-----------------------
11y=35 |:11
y=35/11
x+35/11=7
x=42/11
y=35/11=3 2/11
y=42/11=3 9/11
6/x=5/y
x+y=7
-5x+6y=0
x+y=7 |·5
-5x+6y=0
5x+5y=35
+-----------------------
11y=35 |:11
y=35/11
x+35/11=7
x=42/11
y=35/11=3 2/11
y=42/11=3 9/11