rozwiąż równianie metoda a) podstawiania b)przeciwnych współczynników
1. 2x-y=3 2. -3x+y=4
-3x+2y=-4 6x-2y=-8
daje naj za dobre odp.
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1.
- y = 3 - 2x/*(-1) 2x - y = 3 /*2 2x - y=3 /* 3
- 3x + 2y = - 4 - 3x + 2 y = - 4 -3x + 2y= - 4 / * 2
y = -3 + 2x 4 x - 2y = 6 6 x - 3y = 9
-3 x + 2(-3 + 2x) = -4 - 3x + 2y = -4 - 6x + 4 y = -8
y= -3 + 2x 4 x - 2y - 3x + 2y= 2 6x - 3y - 6x + 4y= 1
-3x - 6 + 4 x = - 4 x = 2 y=1
y=-3 + 2x
x = - 4 +6
y = - 3 + 2x
x = 2
y = - 3 + 2 *2
x = 2
y = -3 + 4 = 1
x = 2
2
-3 x + y = 4 -3 x + y = 4 /*2 -3x +y= 4 /*2
6x - 2y= -8 6x - 2y= -8 6x - 2 y = -8
y = 4 + 3x -6x + 2y = 8 -6x + 2y + 6x - 2y= 8 + (-8)
6x - 2 (4 + 3 x)= - 8 6 x - 2 y = -8 __________________
y = 4+3x 0 = 0 0=0
6x - 8 - 6 x = - 8
y=4+3x
0= 0
y = 4 + 3 * 0 = 4
0=0
licze na naj: )
a)
2x-y=3
-3x+2y=-4
-y=3-2x /*(-1)
y=-3+2x
-3x+2(-3+2x)=-4
-3x-6+4x=-4
-3x+4x=-4+6
x=2
2*2-y=3
4-y=3
-y=3-4
-y=-1 /*(-1)
y=1
-3x+y=4
6x-2y=-8
y=4+3x
6x-2(4+3x)=-8
6x-8-6x=-8
0=-8+8
0=0
b)
2x-y=3 /*3
-3x+2y=-4 /*2
6x-3y=9
-6x+4y=-4
_________
y=5
6x-3*5=9
6x=9+15
6x=24 /:6
x=4
-3x+y=4 /*2
6x-2y=-8
-6x+2y=8
6x-2y=-8
____________
0=0