Odpowiedzi

2009-03-25T19:28:59+01:00
Drugie równanie monożymy przez 100

x+y=10000
8x+5y=67400

x=10000-y
80000-8y+5y=67400

y=4200
x=5800
2009-03-25T19:29:40+01:00

x+y = 10000
0.08x + 0.05y = 674 /*(-20)

x+y = 10000
-1.6x -y = -13480
------------------ +
-0.6x = -3480 / (-0.6)
x = 5800
------------------
x+y = 10000
5800 + y =10000
y = 4200

Wynik:
x = 5800
y = 4200
2009-03-25T19:33:06+01:00
1. x+y=10 000 -> x=10000-y
2. 8%x+5%y=674 -> 2/25*x+1/20*y=674 ->2/25*(10000-y)+1/20*y+674
800-2/25*y+1/20*y=674 -> -0,03*y=-126 -> y=4200
1. x=10000-y -> x=10000-4200 -> x=5800