Question

Uklady rownan , mam takie rownanie \ x/y=3/5 x+y=120 Prosze o rozwiazanie

Answer 1

x/y=3/5

x+y-120

3y=5x
x= 120-y
i teraz podstawiamy do 1

5(120-y)=3y
120=8y
y=75
x=45
pozdrawiam

Answer 2

x/y=3/5

x+y=120

 

5x=3y

x+y=120

 

-5x+3y=0

5x+5y=600

------------+

 

8y=600

y=75

 

y=75

x=120-75

 

y=75

x=45