Question

Rezolvati prin metoda substitutiei 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=-1y
y=3x+2

Answer 1

a) x=y+5<br />x+y=11<br />y+5+y=11=> 2y+5=11=> 2y=6 => y=3. <br />x+y=11=> x+3=11=> x=8