układ równań
-4x+3y=1 |*3
3x+4y=18 |*4-12x + 9y = 912x + 16y = 72 9y- 16y = 9-72-7y= -637y = 63 | :7y=9y=93x + 4y = 18
y=93x + 4* 9 = 18
y = 93x + 36 = 18y = 9 3x = 18 -36
y=93x= -18y=9x =-6x= -6y=9
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-4x+3y=1 |*3
3x+4y=18 |*4
-12x + 9y = 9
12x + 16y = 72
9y- 16y = 9-72
-7y= -63
7y = 63 | :7
y=9
y=9
3x + 4y = 18
y=9
3x + 4* 9 = 18
y = 9
3x + 36 = 18
y = 9
3x = 18 -36
y=9
3x= -18
y=9
x =-6
x= -6
y=9