Jak możecie, to obliczcie krok po kroku i napiszcie, to tutaj. Z góry dziękuję.
a)
2x + 5y = - 6
7x + 4y = - 21
b)
2x - 6y = 8
- 3x + 9y = - 18
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A.2x+5y=-6/*4
7x+4y=-21/*(-5)
8x+20y=-24
-35x-20y=-105
8x+20y-35x-20y=-24-105
-27x=-129/:(-27)
x=4,7
2x+5y=-6/*7
7x+4y=-21/*(-2)
14x+35y=-42
-14x-8y=42
14x+35y-14x-8y=-42+42
27y=0/:27
y=0
B.2x-6y=8/*3
-3x+9y=-18/*2
6x-18y=24
-6x+18y=-36
6x-18y-6x+18y=24-36
0=-12