Rozwiąż układy równań metodą podstawiania:
a) 3x - y = 2
x - y = 1
b) 2x - 6x = - 4
3y - 5x = - 6
c) x - 2y = 5
x + y = 26
d) 2x + y = 7
5x - 2y = 4
e) x - 3y = 5
4x + 5y = 1
Proszę o szybką pomoc (zadane na jutro).
DAJE NAJ. !!!! ; )
" 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 = 2
{x - y = 1
---
{y=3x-2
{x-3x+2=1
---
{y=3x-2
{-2x=-1
---
{y=3x-2
{x=1/2
---
{y=3*1/2 -2
{x=1/2
---
{y=3/2 - 6/2
{x=1/2
---
{y=-3/2
{x=1/2
=============
b)
{2x - 6x = - 4
{3y - 5x = - 6
---
{-4x=-4
{3y=5x- 6
---
{x=1
{3y=-1
---
{x=1
{y=-1/3
===================
c)
{x - 2y = 5
{x + y = 26
---
{x=5+2y
{5+3y=26
---
{x=5+2y
{3y=21
---
{x=5+2y
{y=7
---
{x=5+2*7
{y=7
---
{x=5+14
{y=7
---
{x=19
{y=7
===================
d)
{2x + y = 7
{5x - 2y = 4
---
{y=7-2x
{5x-14+4x=4
---
{y=7-2x
{9x=18
---
{y=7-2x
{x=2
---
{y=7-2*2
{x=2
---
{y=3
{x=2
===================
e)
{x - 3y = 5
{4x + 5y = 1
---
{x=5+3y
{20+12y+5y=1
---
{x=5+3y
{17y=-19
---
{x=5+3y
{y=-19/17
---
{x=85/17 - 57/17
{y=-19/17
---
{x=28/17
{y=-19/17