Rozwiąż układ równań metodą podstawiania
2x - y=4
x=x
-3x+0,5y=(-20)
6x-y=40
1/2x+1cała3/4y=8
1/4x-3/8y=(-1)
5y-3x=4
2y-x=6
x+y=0
-3x-2y=5
3x+2y+2=4(x+1)
2(x-3)-3y=(-9)
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a)
2x-y=4
x=y
2y-y=4
y=4
x=4
spr:
2x-y=4
2*4-4=4
8-4=4
4=4
b)
-3x+0,5y=(-20)
6x-y=40/:(-1)
y=-40+6x
-3x+0,5(-40+6x)=-20
-3x-20+3x=-20
0=0
c)
1/2x+1cała3/4y=8/:(1/2)
1/4x-3/8y=(-1)
x=16-3,5y
0,25(16-3,5y)-0,375y=-1
4-0,875y-0,375y=-1
-1,25y=-5
y=4
x=16-3,5*4
x=16-14
x=2
spr:
1/2x+1cała3/4y=8
1/2*2+1i3/4*4=8
1+7=8
8=8
d)
5y-3x=4
2y-x=6/:(-1)
x=-6+2y
5y-3(-6+2y)=4
5y+18-6y=4
-y=-14
y=14
x=-6+2*14
x=-6+28
x=22
spr:
5y-3x=4
5*14-3*22=4
70-66=4
4=4
e)
x+y=0
-3x-2y=5
x=-y
-3(-y)-2y=5
3y-2y=5
y=5
x=-5
spr:
x+y=0
-5+5=0
0=0
f)
3x+2y+2=4(x+1)
2(x-3)-3y=(-9)
3x+2y+2=4x+4
2x-6-3y=-9
-x+2y=2/:(-1)
2x-3y=3
x=-2+2y
2(-2+2y)-3y=3
-4+4y-3y=3
y=7
x=-2+2*7
x=-2+14
x=12
spr:
3x+2y+2=4(x+1)
3*12+2*7+2=4(12+1)
36+14+2=48+4
52=52