Question

Punctul A(a,b) apartine GF data de F:r->R, f(x)=3x-2
Daca a/b=3/7

a=?
b=?

Answer 1

A(a,b)∈Gf⇔f(a)=b⇔3a-2=b
a/b=3/7⇒b=7a/3

3a-2=7a/3⇒9a-6=7a⇒9a-7a=6⇒2a=6⇒a=3
b=3a-2=9-2=7

a=3
b=7

Answer 2

Salut!
Ai ca f(a) = b => 3a - 2 = b;
Insa, a/b = 3/7 => a/(3a-2) =3/7 => 7a = 9a - 6 => -2a = -6 => a = 3 => b = 9-2 => b = 7.
Bafta!