Răspuns :
x/y = 7/5
x-y = 42 .
x = 42+ y
⇒ 42+y/y = 7/5
⇒5(42+y) = 7y
210 + 5y = 7y
210 = 7y-5y
210=2y
y=210:2
y=105
x =105+ 42
x=147.
x-y = 42 .
x = 42+ y
⇒ 42+y/y = 7/5
⇒5(42+y) = 7y
210 + 5y = 7y
210 = 7y-5y
210=2y
y=210:2
y=105
x =105+ 42
x=147.