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Dane:
y- odzież męska
x - odzież damska
40000 - zarobek firmy na spodniach
120000 - -||- na płaszczach
10% x + 20% y = 40000
40% x + 30% y = 120000
0,1x + 0,2y = 40000 /*10
0,4x + 0,3y = 120000 /* (-10)
x + 2y =400000 /*4
-4x - 3y = -1200000
4x + 8y = 1600000
-4x - 3y = - 1200000
5y = 400000 /:5
y = 80000
x + 160000 = 400000
x= 400000 - 160000
x= 240000
240000 + 80000 = 320000
4/109
x + y = 1000
1,2 x + 8y = 1100 / *10
x + y = 1000 / * (-8)
12x + 8 y= 11000
-8x -8y = -8000
12x + 8y= 11000
4x= 3000 /:4
x= 750
750+ y = 1000
y = 1000- 750
y = 250
5/109
l- lustro
s - stół
s + l = 4050
1,4 s + 1,25 l = 5310/ * 100
s+ l = 4050 /*(-125)
140s + 125l = 531000
-125s - 125l = -506250
140s + 125l = 531000
15s= 24750 /:15
s= 1650
s+l= 4050
1650 + l = 4050
l= 4050- 1650
l = 2400
Mam nadzieję, że pomogłam. :P