Problemi numerici, sistemi

Question

[attach]118021[/attach] Spiegare gentilmente i ragionamenti e argomentare.

EidosM · Accepted Answer

{ 2x - y = 5 { x + y = 2*8 Sommando 3x = 5 + 16 x = 21/3 = 7 y = 16 - 7 = 9

remanzini_rinaldo · Answer

2a-b = 5 a+b = 16 a+2a-5 = 16 3a = 21  a = 7  b = 16-7 = 9

gramor · Answer

[attach]118442[/attach] ============================================================  small  begin {Bmatrix}2x-y&=&5 dfrac {x+y}{2}&=&8 end {Bmatrix}  small  begin {Bmatrix}2x-y&=&5 x +y&=&16 end {Bmatrix}  small  begin {Bmatrix}2x-y&=&5 x &=&16-y end {Bmatrix}  small  begin {Bmatrix}2(16-y)-y&=&5 x &=&16-y end {Bmatrix}  small  begin {Bmatrix}32-2y-y&=&5 x &=&16-y end {Bmatrix}  small  begin {Bmatrix}-3y&=&5-32 x &=&16-y end {Bmatrix}  small  begin {Bmatrix}-3y&=&-27 x &=&16-y end {Bmatrix}  small  begin {Bmatrix} dfrac { cancel {-3}y}{ cancel {-3}}&=& dfrac {-27}{-3} x &=&16-y end {Bmatrix}  small  begin {Bmatrix}y&=&9 x &=&16-9 end {Bmatrix}  small  begin {Bmatrix}y&=&9 x &=&7 end {Bmatrix}

Problemi numerici, sistemi

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