Rozwiąż graficznie i algebraicznie układ ównań.
A) 3x+y=5
x-2y=-3
B) x-2y=0
3x-y=10
C) 1/2x -2y=5
x-2=4+2y
D) 0,5x+0,75y=2
0,25y=3+x
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a)
{3x+y=5
{x-2y=-3 /*(-3)
{3x+y=5
{-3x+6y=9
_____________
7y=14 /:7
y=2
3x+2=5
3x=5-2
3x=3 /:3
x=1
b)
{x-2y=0 /*(-3)
{3x-y=10
{-3x+6y=0
{3x-y=10
_____________
5y=10 /:5
y=2
x-2*2=0
x=4
c)
{1/2x-2y=5
{x-2=4+2y /*(-1/2)
{1/2x-2y=5
{-1/2x+1=-2-y
{1/2x-2y=5
{-1/2x+y=-3
__________
-y=2 /*(-1)
y=-2
1/2x-2*(-2)=5
1/2x+4=5
1/2x=1 /*2
x=2
d)
{0,5x+0,75y=2
{0,25y=3+x
{0,5x+0,75y=2
{-x+0,25y=3 /*0,5
{0,5x+0,75y=2
{-0,5x+0,25y=1,5
_______________
y=3,5
0,5x+0,75*3,5=2
0,5x+2,625=2
0,5x=2-2,625
0,5x=-0,625 /:0,5
x=-1,25