7x^2-5x=y система 7x-5=y

[latex] left { {{7x^2-5x=y} atop {7x-5=y} ight. \left { {{7x^2-5x=7x-5} atop {7x-5=y} ight \ 7x^2-5x=7x-5 \ 7x^2-12x+5=0 \ D=12^2-4*7*5=144-140=4 \ x_1= frac{12+2}{2*7}=1 \ x_2= frac{12-2}{2*7}= frac{10}{14}= frac{5}{7} \ left { {{x_1=1} atop {y_1=7*1-5=2}} ight. \ left { {{x_2= frac{5}{7} } atop {y_2=7* frac{5}{7} -5=0}} ight. [/latex]два решения системы [latex](1;2)[/latex] и [latex]( frac{5}{7};0)[/latex]