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3m+n=9 /*5
2m-5n=(-11)
15m+5n=45
2m-5n=(-11)
----------------dodajemy
17m=34
m=2
3m+n=9
3*2+n=9
n=9-6
n=3
d)
5x=4-2y
4x+y=3
5x+2y=4
4x+y=3 /*(-2)
5x+2y=4
-8x-2y=-6
------------dodaj
-3x=-2
x=2/3
4* 2/3+y=3
y=3-8/3
y=1/3
3m+n=9
2m-5n=(-11)
n=9-3m
2m-5(9-3m)=-11
n=9-3m
2m-45+15m=-11
n=9-3m
17m=45-11
n=9-3m
m=34/17
n=9-3m
m=2
n=9-3*2
m=2
n=3
m=2
d)
5x=4-2y
4x+y=3
5x=4-2y
y=3-4x
5x=4-2(3-4x)
y=3-4x
5x=4-6+8x
y=3-4x
5x-8x=-2
y=3-4x
3x=2
y=3-4x
x=2/3
y=3-4(2/3)
x=2/3
y=3-8/3
x=2/3
y=1/3
3m+n=9 mnożymy przez 5
2m-5n=(-11)
15m + 5n = 45
2m - 5n = - 11
dodajemy stronami
15m + 2m + 5n - 5n = 45 - 11
17m = 34
m = 34/17 = 2
3m + n = 9
6 + n = 9
n = 9 - 6 = 3
m = 2
n = 3
d
5x=4-2y
4x+y=3
5x + 2y = 4
4x + y = 3 mnożymy przez - 2
5x + 2y = 4
- 8x - 2y = - 6
dodajemy stronami
5x - 8x + 2y - 2y = 4 - 6
- 3x = - 2
x = 2/3
4x + y = 3
4 razy 2/3 + y = 3
8/3 + y = 3
y = 3 - 8/3 = 3 - 2 i 2/3 = 1/3
x = 2/3
y =1/3