układy równań
w jednej klamerce ({ ) sa dwa rownania
a)
{3m+n=9
2m-5n=-11
b)
{5x=4-2y
4x+y=3
z gory dzieki
3m+n=9 |*5
15m+5n=45
_____________
17m=34
m=2
3*2+n=9
6+n=9
n=3
5x=4-2y
5x+2y=4
4x+y=3 |*(-2)
-4x-2y=-6
_______________
x=-2
5*(-2)+2y=4
-10+2y=4
2y=14
y=7
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a)
3m+n=9 |*5
2m-5n=-11
15m+5n=45
2m-5n=-11
_____________
17m=34
m=2
3*2+n=9
6+n=9
n=3
m=2
n=3
b)
5x=4-2y
4x+y=3
5x+2y=4
4x+y=3 |*(-2)
5x+2y=4
-4x-2y=-6
_______________
x=-2
5*(-2)+2y=4
-10+2y=4
2y=14
y=7
x=-2
y=7