Question

Salut Am nevoie de ajutor la ex asta

a) 3x+y=6
2x+3y=11

b) -x+y=-3
x+2y=-3

c) 5x+y=-11
2x+3y=-7

d) 7x-3y=1
2x+5y=12

e) 2x+y=3
-x+4y=21

f) -2x+3y=1
3x-4y=-1

g) x-2y=-5
3x+y=6


DAU 30 DE PUCTE SI COROANA​

Answer 1

a) 3x+y=6 <=> y=6-3x <=> y=6-3x <=> y=6-3x <=>

2x+3y=11 <=> 2x+3(6-3x)=11 <=> 2x-18-9x=11 <=>

<=> y=6-3x <=> y=6-3 <=> y=6-3x <=> y=6-3x <=>

<=> -7x-18=11 <=> -7x=11+18 <=> -7x=29 <=> x=-29/7

<=> y=6-3-29/7 <=> y=-8/7

<=> x=-29/7 <=> x=-28/7

Mai departe trebuie sa le faci la fel.

P.S. este aplicatia photomath care te poate ajuta la astel de ecuatii.