Hej! Bardzo potrzebuje pomocy :C Żeby dostać dwójke muszę zrobić te zadania. Nie bądźcie obojętni ;(
TO SĄ UKŁADY RÓWNAŃ!!!
a) y+2 -(3-x)=0
x-2=5-(2-y)
b) 3(x-y)+4x=8
3(x-5y)=5-9y
c) 3(2x-1)+4(y-2)=9
2(5x-1)+3y=5(3x+y)+2
d) 2(x+y)-3(x-2y)= -7x-2
5(x+1)-2(3-y)=-4(x+y)
PROSZE POMÓŻCIE MI! :(
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TO SĄ UKŁADY RÓWNAŃ!!!
a) y+2 -(3-x)=0
x-2=5-(2-y)
y+2-3+x = 0
x-2 = 5-2+y
y+x = 0-2+3
x = 5-2+2+y
y+x = 1
x = 5+y
y+5+y = 1
x = 5+y
2y = 1-5
x = 5+y
2y = -4 /:2
x = 5+y
y = -2
x = 5+(-2)
y = -2
x = 3
b) 3(x-y)+4x=8
3(x-5y)=5-9y
3x-3y+4x = 8
3x-15y = 5-9y
7x-3y = 8
3x-15y+9y = 5
7x-3y = 8 /·(-2)
3x-6y = 5
-14x+6y = -16
3x-6y = 5
-----------------------
-11x = -11 /:(-11)
x = 1
3(x-y)+4x=8
3(1-y)+4·1 = 8
3-3y+4 = 8
-3y = 8-3-4
-3y = 1 /:(-3)
y = -1/3
x = 1
y = -1/3
c) 3(2x-1)+4(y-2)=9
2(5x-1)+3y=5(3x+y)+2
6x-3+4y-8 = 9
10x-2+3y = 15x+5y+2
6x+4y = 9+3+8
10x-15x+3y-5y = 2+2
6x+4y = 20
-5x-2y = 4 /·2
6x+4y = 20
-10x-4y = 8
---------------------
-4x = 28 /:(-4)
x = -7
3(2x-1)+4(y-2)=9
3[2·(-7)-1]+4y-8 = 9
3(-14-1)+4y-8= 9
3·(-15)+4y-8 = 9
-45+4y-8 = 9
4y = 9+45+8
4y = 62 /:4
y = 15 1/2
d) 2(x+y)-3(x-2y)= -7x-2
5(x+1)-2(3-y)=-4(x+y)
2x+2y-3x+2y = -7x-2
5x+5-6+2y = -4x-4y
2x-3x+7x+4y = -2
5x+4x+2y+4y = -5+6
6x+4y = -2 /·3
9x+6y = 1 /·(-2)
18x+12y = -6
-18x-12y = -2
----------------------
0 = -8
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