Question

Stiind ca x+y=100 si x-y=10 aflati necunoscuta

Answer 1

x+y=100, x-y=10, adunam cele doua ecuatii

x+y+x-y=100+10, 2x=110, x=110/2=55, y=100-55=45

Answer 2

X /____/.10./

Y /____/

Suma x+y=100

Egalam segm

100-10=90(2 segm)

Nr Y

90:2=45

Nr X

45+10=55

Verificare

55+45=100

55-45=10