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Cum pot afla necunoscutele daca
X x 3=y
x+y=48


Răspuns :

x*3=y 
x+y=48=>x=48-y
3(48-y)=y =>144-3y=y =>4y=144=>y=36
x=48-36=>x=12
proba:36+12=48
y=3x
⇒x+3x=48
⇒4x=48
⇒x=48/4
⇒x=12;
⇒y=3x
⇒y=3·12
⇒y=36;
Verificare 12+36=48;