Question

Repare o sistema e resolva: 2x+3y=14 x-2y=-7

Answer 1

2x + 3y = 14 ( vezes - 7 )
14x - 2y = -7
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-14x - 21y  = - 98
 14x - 2y    = - 7
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//      - 23y   =- 105
23y = 105
y = 105/23 = 

2x + 3 ( 105/23)  = 14
2x/1 + 315/23  = 14/1
mmc =23
46x + 315 = 322
46x = 322 - 315
46x = 7
x = 7/46 ***