Question

3 pixuri si 5 stilouri costa 41 lei iar 7 pixuri si 3 stilouri costa 35 de lei .
Aflati cat costa un pix si un stilou

Answer 1

x= pixuri
y= stilouri

3x+5y=41 | ×3
7x+3y=35| ×5

9x+15y=123
35x+15y=175
scazi ecuatiile =>

26x=52
x=2 => 6 + 5y= 41
y=7

Answer 2

Răspuns

3x2+5x7=6+35=41   7x2+3x7=14+21=35

Explicație pas cu pas:

3p........5s.........41lei/x3              

7p.........3s.........35lei/x5

9p.......15s.........123lei

35p......15s.........175lei

26........................52

p=52:26

p=2

(3x2)+5s=41

6+5s=41

5s=41-6=>35

s=35:5

s=7  

Cu placere!!!!!!!!!!!!!!!!!!!