Question

a+b=70;a-b=30;a=?;b=?

Answer 1

sper ca te-am ajutat

Answer 2

a+b = 70 ; a-b = 30 ; adunam cele 2 ecuatii si obtinem

a+b+a-b = 70+30 ; 2a = 100 ; a = 100:2 = 50 ; b = 70-50 = 20 ;