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Rozwiąż układ równań:
a) 2x+5y=26/*(-3)
3x-2y=1/*2
-6x-15y=-78
6x-4y=2
------------------------
-19y=-76
y=4
3x-8=1
y=4
3x=9
y=4
x=3
y=4
b) 4x-y=18
5x+2 1/2y=30
y=4x-18
5x+5/2(4x-18)=30
y=4x-18
5x+10x-45=30
y=4x-18
15x=75
y=2
x=5
2x + 5y = 26 /*3
3x - 2y = 1 /*(-2)
6x + 15y = 78
-6x + 4y = -2
19y = 76
3x - 2y = 1
y = 4
3x = 1 + 2y
y = 4
3x = 1 + 8
y = 4
x = 3
b) 4x - y = 18
5x + 2 1/2y = 30 //: 2,5
4x - y = 18
2x + y = 12
6x = 30
4x - y = 18
x = 5
y = 4x - 18
x = 5
y = 20 - 18
x = 5
y = 2
3x-2y=1
5x=27/:5
2x+2y=26
x=5,4
2*5,4-2y=26
x=5,4
10,8-2y=26
x=5,4
-2y=26-10,8
x=5,4
-2y=15,2/:2
x=5,4
y=7,6
b) 4x-y=18/*-5
5x+2 1/2y=30/*4
-20x+5y=90
20x+10y=120
15y=210/:15
4x-y=18
y=14
4x-14=18
y=14
4x=18+14
y=14
4x=32/:4
y=14
x=8