rozwiąż prosty układ równań ( muszę tylko spr. wynik ) { x + y = 80 { 0,3x + 0.4y = 27
x+y=80
0,3x+0,4y=27
x=80-y
0,3x=27-0,4y / razy 10
3x=270-4y
{ x + y = 80
{ 0,3x + 0.4y = 27
x = 80-y
0,3(80-y)+0,4y = 27
24-0,3y+0,4y = 27
0,1y = 27-24
0,1y = 3 /: 0,1
y = 30
x = 80-30
x = 50
Spr.
50+30 = 80
0,3·50+0,4·30 = 27
80=80
15+12 = 27
80 = 80
27 = 27 OK.
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x+y=80
0,3x+0,4y=27
x=80-y
0,3x=27-0,4y / razy 10
x=80-y
3x=270-4y
{ x + y = 80
{ 0,3x + 0.4y = 27
x = 80-y
0,3(80-y)+0,4y = 27
x = 80-y
24-0,3y+0,4y = 27
x = 80-y
0,1y = 27-24
x = 80-y
0,1y = 3 /: 0,1
x = 80-y
y = 30
x = 80-30
y = 30
x = 50
y = 30
Spr.
{ x + y = 80
{ 0,3x + 0.4y = 27
50+30 = 80
0,3·50+0,4·30 = 27
80=80
15+12 = 27
80 = 80
27 = 27 OK.