Rozwiąż układy równań metodą przeciwnych wpółczynników.
c){x-y=2
{½x-1=¼y
d){5x-1=3y
{1,6y-2=4-2x
f) {4x+3y=54
{⅓x=4(1+⅛y)
dziękuje z góry. ;)
c){x-y=2
{½x-1=¼y /*4
x - y = 2 /*(-1)
2x - 4 = y
-x + y = -2
2x - y = 4
--------------
-x + 2x + y - y = -2 + 4
x = 2
2 * 2 - 4 = y
4 - 4 = y
y = 0
d){5x-1=3y
{1,6y-2=4-2x
5x - 3y = 1 /*(-2)
1,6y + 2x = 6 / *5
-10x + 6y = -2
8y + 10x = 30
-------------------
-10x + 10x + 6y + 8y = - 2 + 30
14y = 28 /:14
y = 2
8 * 2 +10x = 30
10x = 30 -16
10x = 14 /:10
x = 1,4
f) {4x+3y=54
{⅓x=4(1+⅛y)
4x + 3y = 54
⅓x = 4+ ½y /*6
4x + 3y = 54
2x = 24 + 3y
4x + 3y = 54
2x - 3y = 24
------------------
4x + 2x + 3y - 3y = 54 + 24
6x = 78 /:6
x = 13
2 * 13 - 3y = 24
-3y = 24 - 26
-3y = -2
y = 2/3