Rozwiąż układ równań metodą podstawiania.
a) 2x-5(y+1)=-5
-x=-y+6
b)2x-5(y+1)=-5
-x+2(y+2)=4
c)2y-(3+y)=0
-x+0,5y=2
d)3x+y=4
6x-(1-2y)=8
e)1/6x-y=8
1/3-2y=16
f)^2x+y=3
2y-x=6
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a) 2x-5(y+1)=-5
-x=-y+6 | *-1)
2x-5(u+1)=5
x = y -6
2*(y-6) -5y+5 = -5
2y-12-5y+5 = -5
-3y +7 = -5 | +3y
7 = -5+3y | +5
12 = 3y |:3
y = 4
x = y-6
x = 4-6
x = -2
y=4
spr.
-x=-y+6
- (-2) = -4 +6
2 = 2
b)2x-5(y+1)=-5
-x+2(y+2)=4
-x +2y+4 = 4 | *(-1)
x-2y-4 = -4 | +2y+4
x = 2y
2*(2*y) -5y-5 = -5
4*2y -5y -5 = -5
8y-5y -5 = -5
3y-5=-5 | +5
3y=0
równanie sprzeczne
c)2y-(3+y)=0
-x+0,5y=2 |*(-1)
x-1/2y = 2 | +1/2y
x= 2 + 1/2y
2y -3-y = 0
2y-3 -(2+1/2y) = 0
2y-3 -2-1/2y = 0
2y-5 - 1/2y = 0
+5
1/2y = 5 | : 1/2
y = 5 : 1/2
y = 5 * 2/1
y = 10
x = 2+1/2 * 10
x= 2+5
x = 7
y=10
x= 7
spr.
-x+0,5y=2
- 7 + 0,5 * 10 =2
- 7 +5 = 2
2=2
d)3x+y=4 |-3x
6x-(1-2y)=8
y = 4-3x
6x -1 +2y = 8
6x -1 + 2* (4-3x) = 8
6x -1 + 8 - 6x = 8
6x +7 - 6x = 8 |-7
6x-6x = 1
0=1
równanie sprzeczne
a)
2x -5(y+1) = -5
-x = -y + 6
2x – 5y – 5 = - 5
-x + y = 6
2x - 5y = -5+5
-x + y = 6
2x - 5y = 0
-x + y = 6 /*2
2x - 5y =0
-2x +2 y = 12
-------------------
-3y = 12 /: (-3)
y = -4
-x = -(-4) + 6
-x = 10 /*(-1)
x = -10
y= -4
b)
2x -5(y+1) = -5
-x + 2(y+2) = 4
2x – 5y – 5 = -5
-x + 2y + 4 = 4
2x -5y = -5+5
-x + 2y = 4 – 4
2x – 5y = 0
-x + 2y = 0 /*2
2x-5y = 0
-2x + 4y = 0
-------------------
-y = 0
y = 0
2x – 5*0 = 0
2x = 0
x = 0
y = 0
c)
2y – (3+y) = 0
-x + 0,5y = 2
2y – 3 – y =0
-x + 0,5y = 2
y = 3
-x + 0,5 * 3 = 2
y=3
-x = 2 -1,5
y= 3
-x = 0,5 /* (-1)
y=3
x = -0,5
d)
3x + y = 4
6x – (1-2y) = 8
3x +y = 4
6x – 1 + 2y = 8
3x + y = 4
6x + 2y = 8+1
3x + y = 4 /*(-2)
6x + 2y = 9
-6x – 2y = -8
6x + 2y = 9
-----------------
0 = -1
układ sprzeczny , brak rozwiązań
e)
1/6x – y = 8 /*6
1/3 – 2y = 16 /*3
x – 6y = 48
1 – 6y = 48
x – 6y = 48
– 6y = 48 – 1
x – 6y = 48
– 6y = 47 / : (-6)
x - 6y = 48
y = -47/6
x – 6*(-47/6) = 48
y =- 47/6
x = 48 -47
y = -47/6
x =1
y = -47/6
f)
2x + y = 3
2y –x = 6 /*2
2x + y = 3
-2x + 4y = 12
------------------
5y = 15 /:5
y = 3
2x + 3 = 3
2x = 3 – 3
2x = 0
x = 0
y = 3