Question

Rezolvati in RxR sistemul de ecuații prin metoa reducerii x2
{2x-3y=-1
{5x+6y=11
Sti doar raspunsul {(1;1)}

Answer 1

$\left \{ {{2x-3y=-1} |*2 \atop {5x+6y=11}} \right. \ \textless \ =\ \textgreater \ \left \{ {{4x-6y=-2} \atop {5x+6y=11}} \right.|+ \ \textless \ =\ \textgreater \ \left \{ {{4x-6y=-2} \atop {9x=9}} \right. \ \textless \ =\ \textgreater \ \left \{ {{x=1} \atop {4*1-6y=-2}} \right. \\ \ \textless \ =\ \textgreater \ \left \{ {{x=1} \atop {-6y=-2-4}} \right. \ \textless \ =\ \textgreater \ \left \{ {{x=1} \atop {-6y=-6}} \right.\ \textless \ =\ \textgreater \ \left \{ {{x=1} \atop {y=1}} \right.$
S={(1, 1)}