oblicz
a)metoda podstawiania
y=2x-1
4x+y=8
b)metoda przeciwnych wspolczynnikow
-3x+4y=7
2x-3y=-6
4x+2x-1=8
6x=8+1
x=9:6
x=1,5
y=2*1,5-1
y=2
-3x+4y=7 /*2
2x-3y=-6 /*3
-6x+8y=14
6x-9y=-18
-y=-4
y=4
2x=-6-3*4
2x=-6-12
2x=-6
x=-6:2
x=-3
a) y=2x-1
4x+ 2x-1=8
4x+2x=8+1
6x=9/:6
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y=2x-1
4x+y=8
y=2x-1
4x+2x-1=8
y=2x-1
6x=8+1
y=2x-1
x=9:6
y=2x-1
x=1,5
y=2*1,5-1
x=1,5
y=2
x=1,5
-3x+4y=7 /*2
2x-3y=-6 /*3
-6x+8y=14
6x-9y=-18
-y=-4
2x-3y=-6
y=4
2x=-6-3*4
y=4
2x=-6-12
y=4
2x=-6
y=4
x=-6:2
y=4
x=-3
a) y=2x-1
4x+ 2x-1=8
y=2x-1
4x+2x=8+1
y=2x-1
6x=9/:6
y=2x-1
x=1,5
y=2*1,5-1
x=1,5
y=2