1.Rozwiąż: a)x+2y=-1 x-y=-4 tu powinna być klamra. b)3x+y=-3 2x-3y=-2 tu powinna być klamra. c)3x-y=2 x-3y=-10 tu powinna być klamra. Pilne.
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A] x+2y= -1
x-y= -4
x= -1-2y
-1-2y-y= -4
x= -1-2y
-2y-y= -4+1
x= -1-2y
-3y= -3 /:[-3]
x= -1-2y
y=1
x= -1-2*1 spr. -3+2*1=-3+2= -1
y=1 -3-1= -4
x= -1-2
y=1
x= -3
y=1
b] 3x+y= -3
2x-3y= -2
y= -3-3x
2x-3*[-3-3x]= -2
y= -3-3x
2x+9+9x= -2
y= -3-3x
2x+9x= -2-9
y= -3-3x
11x= -11 /:11
y= -3-3x spr.3*[-1]+0= -3+0= -3
x = -1 2*[-1]-3*0= -2-0= -2
y= -3-3*[-1]
x= -1
y=-3+3
x= -1
y=0
x= -1
c] 3x-y=2
x-3y= -10
3x-y=2
x= -10+3y
3*[-10+3y]-y=2
x= -10+3y
-30+9y-y=2
x= -10+3y
9y-y=2+30
x= -10+3y
8y=32 /:8 spr.3*2-4=6-4=2
x= -10+3y 2-3*4=2-12= -10
y=4
x= -10+3*4
y=4
x= -10+12
y=4
x=2