Răspuns:
[tex] \bf\red{\bigg( \dfrac{160}{283}; \dfrac{136}{283}\bigg)}[/tex]
Explicație pas cu pas:
{x, y} i.p. {17, 20}
[tex]17x = 20y\Rightarrow x = \dfrac{20y}{17} [/tex]
[tex]y = f(x) \Rightarrow y = 10 \cdot \dfrac{20y}{17} - 8 \Rightarrow 17y = 300y - 136 \\ [/tex]
[tex]283y = 136 \Rightarrow y = \dfrac{136}{283} [/tex]
[tex]x = \dfrac{20}{17} \cdot \dfrac{136}{283} = \dfrac{160}{283}[/tex]