Question

Afla numerele, stiind ca relatiile din fiecare grupa sunt verificate simultan.....a)x+y=15. X=y+3. B)x+y=30;x=5y. c)x-y=28;x=4*y+4

Answer 1

a) 3+y+y=15

2y+3=15

2y=15-3

2y=12

y=12:2

y=6

x=6+3

x=9

b) 5y+y=30

6y=30

y=30:6

y=5

x=5*5

x=25

c) 4y+4-y=28

3y+4=28

3y=28-4

3y=24

y=24:3

y=8

x=8*4+4

x=32+4

x=36