Question

Rezolvati prin metoda substituiei sistemele:
a) {x=y+5
x+y=11
b) {x-y=2
y=2x-2
c) {x=2y-1
2x+3y=12
d) {5x-4y=-1
y=3x+2

Answer 1

x=11-y
x=5+y.....adica
11-y=5+y......11-y-5-y=0
-2y=6....
y=-3.....
x=11-y adica 11-(-3)...
x=14