Răspuns :
Răspuns:
A) x=2y
x+3y=20
2y+3y=20
5y=20
y=4
B) x=3y
x+2y=15
3y+2y=15
5y=15
y=3
C) y=4x
5x-y=2
5x-4x=2
x=2
D) y=5x
7x-y=2
7x-5x=2
2x=2
x=1
Răspuns:
A) x=2y
x+3y=20
2y+3y=20
5y=20
y=4
B) x=3y
x+2y=15
3y+2y=15
5y=15
y=3
C) y=4x
5x-y=2
5x-4x=2
x=2
D) y=5x
7x-y=2
7x-5x=2
2x=2
x=1