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Ghella [55]
3 years ago
15

AdhkjAhkmhdj help me please

Mathematics
1 answer:
kirza4 [7]3 years ago
7 0
4x+2x=84
3x+5y=126
5x+4y=?
--------------------
cerco la x nella prima equazione:
4x+2y=84 
x=(84-2y)/4
x=(42-y)/2
-------------------------------------------------------------------------
cerco la y nella seconda equazione, sostituendo la x:
3x+5y=126
3[(42-y)/2]+5y=126
y= -18
------------------------------------------------------------------------
cerco la x della nella equazione, sostituendo la y:
4x+2y=84
4x+2(-18)=84
x=30
---------------------------------------------------------------------------------------------------
cerco i totale nella terza equazione, sostituendo i valori della x e della y:
5x+4y= ?
5*30 + 4*(-18)= 150-72 = 78

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