1.Rozwiąż metodą podstawiania
a) x+2y=7 x=3
x=y+1 y=2
b) 2x+y=10 x=4
3x-2y=8 y=2
c) 4x-2y=16 x=5
3x-y=13 y=2
d) 3x-4y=10 x=4
x-2y=3 y=0,5
e) x+2y=-2 x=0
2x-y=1 y=-1
2.Rozwiąż równania metodą przeciwnych współczynników
a) 3x+y=5 x=1
2x-y=0 y=2
b) 2x-y=5 x=3
x+y=4 y=1
c) 3m+n=9 m=2
2m-3n=-5 n=3
d) 3u+2v=2 u=-2
5u+4v=6 v=4
e) 5x+3y=0 x=3
-x-2y=7 y=-5
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zadanie 1
METODA PODSTAWIANIA
a)
{x+2y=7
{x=y+1
{y+1+2y=7
{x=y+1
{3y+1=7
{x=y+1
{3y=6
{x=y+1
{y=2
{x=y+1
{y=2
{x=2+1
{y=2
{x=3
b)
{2x+y=10
{3x-2y=8
{y=10-2x
{3x-2y=8
{y=10-2x
{3x-2(10-2x)=8
{y=10-2x
{3x-20+4x=8
{y=10-2x
{7x-20=8
{y=10-2x
{7x=28
{y=10-2x
{x=4
{y=10-2*4
{x=4
{y=10-8
{x=4
{y=2
{x=4
c)
{4x-2y=16
{3x-y=13
{4x-2y=16
{-y=13-3x
{4x-2y=16
{y=3x-13
{4x-2(3x-13)=16
{y=3x-13
{4x-6x+26=16
{y=3x-13
{-2x+26=16
{y=3x-13
{-2x= -10
{y=3x-13
{x=5
{y=3x-13
{x=5
{y=3*5-13
{x=5
{y=2
d)
{3x-4y=10
{x-2y=3
{3x-4y=10
{x=2y+3
{3(2y+3)-4y=10
{x=2y+3
{6y+9-4y=10
{x=2y+3
{2y+9=10
{x=2y+3
{2y=1
{x=2y+3
{y=1/2
{x=2y+3
{y=0,5
{x=4
e)
{x+2y=-2
{2x-y=1
{x= -2y-2
{2x-y=1
{x= -2y-2
{2(-2y-2)-y=1
{x= -2y-2
{-4y-4-y=1
{x= -2y-2
{-5y-4=1
{x= -2y-2
{-5y=5
{x= -2y-2
{y= -1
{x= -2*(-1)-2
{y= -1
{x=2-2
{y= -1
{x=0
{y= -1
zadanie 2
METODA PRZECIWNYCH WSPÓŁCZYNNIKÓW
a)
{3x+y=5
{2x-y=0
________
5x=5
x=1
{x=1
{3x+y=5
{x=1
{3*1+y=5
{x=1
{3+y=5
{x=1
{y=2
b)
{2x-y=5
{x+y=4
_______
3x=9
x=3
{x=3
{x+y=4
{x=3
{3+y=4
{x=3
{y=1
c)
{3m+n=9 /*3
{2m-3n=-5
{9m+3n=27
{2m-3n= -5
__________
11m=22
m=2
{m=2
{3m+n=9
{m=2
{3*2+n=9
{m=2
{6+n=9
{m=2
{n=3
d)
{3u+2v=2 /*(-2)
{5u+4v=6
{-6u-4v= -4
{5u+4v=6
__________
-u=2
u= -2
{u= -2
{5u+4v=6
{u= -2
{5*(-2)+4v=6
{u= -2
{-10+4v=6
{u= -2
{4v=16
{u= -2
{v=4
e)
{5x+3y=0
{-x-2y=7 /*5
{5x+3y=0
{-5x-10y= 35
____________
-7y=35
y= -5
{y= -5
{5x+3y=0
{y= -5
{5x+3*(-5)=0
{y= -5
{5x-15=0
{y= -5
{5x=15
{y= -5
{x=3