ei ma ajutati
Rezolvati in RxR prin metoda substituiei sistemulde ecuatii:
a)[tex] \left \{ {{7x-3y=13} \atop {x-2y=5}} [/tex]
b)[tex] \left \{ {{2x-3y-1} \atop {x+y=2}} \right. [/tex]
c)[tex] \left \{ {x-2y=0} \atop {4x+5y=26}} \right. [/tex]
d)[tex] \left \{ {{x+4y+2=0} \atop {2x-4y+1=0}} \right. [/tex]
e)[tex] \left \{ {{2x+y=12} \atop {7x-2y=31}} \right. [/tex]
f)[tex] \left \{ {{x-y=1} \atop {2x+y=5}} \right. [/tex]
g)[tex] \left \{ {x+2y=5} \atop {3x-6y=9}} \right. [/tex]
h)[tex] \left \{ {{8y-x=4} \atop {2x-21y=2}} \right. [/tex]