" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a)
{x+2y=9
{-x-3y=16
_________
-y=25 /:(-1)
y= -25
{y= -25
{x+2y=9
{y= -25
{x+2*(-25)=9
{y= -25
{x-50=9 /+50
{y= -25
{x=59
Sprawdzenie:
x+2y=9 -x-3y=16
59+2*(-25)=9 -59-3*(-25)=16
59-50=9 -59+75=16
9=9 16=16
b)
{3x+2y=13
{2x+y=11 /*(-2)
{3x+2y=13
{-4x-2y= -22
___________
-x= -9 /:(-1)
x=9
{x=9
{2x+y=11
{x=9
{2*9+y=11
{x=9
{y+18=11 /-18
{x=9
{y= -7
Sprawdzenie:
3x+2y=13 2x+y=11
3*9+2*(-7)=13 2*9+(-7)=11
27-14=13 18-7=11
13=13 11=11
METODA PODSTAWIANIA
c)
{2x-y=10
{x+5y= -17 /-5y
{2x-y=10
{x= -5y-17
{2(-5y-17)-y=10
{x= -5y-17
{-10y-34-y=10
{x= -5y-17
{-11y-34=10 /+34
{x= -5y-17
{-11y=44 /:(-11)
{x= -5y-17
{y= -4
{x= -5*(-4)-17
{y= -4
{x=20-17
{y= -4
{x=3
Sprawdzenie:
2x-y=10 x+5y= -17
2*3-(-4)=10 3+5*(-4)= -17
6+4=10 3-20= -17
10=10 -17= -17
d)
{3m+n=9 /-3m
{2m-5n= -11
{n=9-3m
{2m-5(9-3m)= -11
{n=9-3m
{2m-45+15m= -11
{n=9-3m
{17m-45= -11 /+45
{n=9-3m
{17m=34 /:17
{n=9-3m
{m=2
{n=9-3*2
{m=2
{n=9-6
{m=2
{n=3
{m=2
Sprawdzenie:
3m+n=9 2m-5n= -11
3*2+3=9 2*2-5*3= -11
6+3=9 4-15= -11
9=9 -11= -11