Question

Urgent am nevoie de ajutor!
Rezolvat in R
a) 3-2(1-3x)=5-2x
b) 0,1(5-2x)-7,3=2,7-1,4x
Trasati dreapta:
2x-3y=5
Rezolvati:
{2(x-y)=3-x+2y
x+2y=7
{3y-2x=5
2y+4x=-1
Astept raspunsurile!

Answer 1

A)3-2+6x=5-2x=>1+6x=5-2x =>8x=4=>x=1/2
B)(5-2x)/10-73/10=27/10-14x/10=>
5-2x-73=27-14x=>12x=95=>x=95/12
Rezolvați:
2x-2y=3-x+2y=>3x-4y=3 si x+2y=7
3x-4y-3(x+2y)=3-21=>-10y=18=>y=-9/5
X+2•(-9/5)=7=>x=7+18/10=88/10
Si:
2(3y-2x)-3(2y+4x)=13=>-16x=13=> x=-13/16
2y+4•(-13/16)=-1=>2y=-1+13/4=9/4