Explicación paso a paso:
x= monedas de 2
y= monedas de 5
2x + 5y = 230
5x + 2y = 155
x = (230 -5y) ÷ 2
x = 115 -5/2y
===>
5(115 -5/2y) + 2y = 155
575 - 25/2y + 2y = 155
575 - 155 = 25/2y -2y
420 = 25/2y - 4/2y
420 = 21/2y
420÷21/2 = y
420 . 2/21 = y
y= 840/21
y= 40
x= 115 - 5/2y
x = 115 - 5/2 . 40 = 115 - 200/2 = 115 -100 = 15
x =15
Hay 15 monedas de 2 pesos y 40 monedas de 5 pesos
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Explicación paso a paso:
x= monedas de 2
y= monedas de 5
2x + 5y = 230
5x + 2y = 155
x = (230 -5y) ÷ 2
x = 115 -5/2y
===>
5x + 2y = 155
5(115 -5/2y) + 2y = 155
575 - 25/2y + 2y = 155
575 - 155 = 25/2y -2y
420 = 25/2y - 4/2y
420 = 21/2y
420÷21/2 = y
420 . 2/21 = y
y= 840/21
y= 40
x= 115 - 5/2y
x = 115 - 5/2 . 40 = 115 - 200/2 = 115 -100 = 15
x =15
Hay 15 monedas de 2 pesos y 40 monedas de 5 pesos