metoda podstawiania :
4m-2n=10
m+n=4
----------
n=-m+4
-------------
4m-2(-m+4)=10
--------------
4m+2m-8=10
------------
6m-8=10 /+8
6m=18 /:6
m=3
n=-1*3+4
n=1
m=4-n
4(4-n)-2n=10
16-4n-2n=10
-6n=-6/:(-6)
m=4-1
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4m-2n=10
m+n=4
----------
4m-2n=10
n=-m+4
-------------
4m-2(-m+4)=10
n=-m+4
--------------
4m+2m-8=10
n=-m+4
------------
6m-8=10 /+8
n=-m+4
------------
6m=18 /:6
n=-m+4
------------
m=3
n=-1*3+4
----------
m=3
n=1
4m-2n=10
m+n=4
m=4-n
4(4-n)-2n=10
m=4-n
16-4n-2n=10
m=4-n
-6n=-6/:(-6)
n=1
m=4-1
n=1
m=3