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{ x-y=1
5x-3y=4

rezolvare prin sistem...acolada pentru ambele ..va rog ajutati-ma


Răspuns :

x-y=1 |•(-3). <=> -3x+3y=-3
5x-3y=4. 5x-3y=4
2x=1=>x=1/2
5•1/2-3y=4
5/2-3y=4
-3y=4+5/2
-3y=13/2|•(-1)
y=(13/2)/-3
y=-19/2
x-y=1
5x-3y=4

y=x-1
5x-3(x-1)=4   
⇒ 5x-3x+3=4   ⇒ 2x=1     x=1/2    y=1/2-1=-1/2

solutia
x=1/2
y=-1/2