Question

sa se afle nr x si y stiind ca 2x+3y=24 si ca x pe y = 3 pe 4​

Answer 1

Răspuns:

2 x + 3y = 24

x/y = 3/4

4x = 3y

2x + 3y = 24  

2x + 4x=24=> 6x=24

x=24/6

x=4

4x=3y

4 x 4 = 3y

16 = 3y

y=16/3

y=5,(3)

Answer 2

Răspuns:

x/y=3/4=>x=3y/4

2x+3y=24

2·3y/4+3y=24

6y/4+⁴⁾3y=⁴⁾24

6y+12y=96

18y=96=>y=96:18=>y=5,(3)

x=3·[(53-5)/9]/4

x=144/9·1/4=144/36=>x=4