Question

Rozwiaz uklad rownan :
x+y = 10 000
0,08x + 0,05y = 674

Answer 1

{x+y = 10 000
{0,08x + 0,05y = 674

x+y = 10 000
x=10000-y

0,08x + 0,05y = 674
0,08(10000-y)+0,05y=674
800-0,08y+0,05y=674
-0,03y=-126
y=4200

x=10000-y
x=5800

Answer 2

x+y = 10 000
0,08x + 0,05y = 674

-8x-8y= -80000
+{
8x+5y=67400
___________________________
5y-8y=67400-80000
-3y= -12600 /:-3
y=4200

x+y=10000 /*-5
0,08+o,o5=674 /*100

-5x-5y= -50000
+{
8x+5y=67400
_________________
-5x+8x= -50000+67400
3x=17400 / :3
x=5800


y=4200
{
x=5800