👤

Daca x +2y=17 si y-3z=4 atunci calculati
a) x+3y-3z=
b) 2x+5y-3z=
c) (3x+6y)+(2y-6z)=
d) (2x+4y)*(x+4y-6z)=
PLS


Răspuns :


a) x+2y=17

     y-3z = 4 , se aduna cele 2 ecuatii => x+2y+y-3z=17+4 <=> x+3y-3z = 21