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3x+2y= 3,90 2x+3y= 3,85
2y= 3,90-3x Reemplazas y
y= 3,90-3x/2 2x+ 3(3,90-3x/2)= 3,85
2x+ (11,70-9x)/2= 3,85
4x+11,70-9x= 7,70
11,70-7,70=9x-4x
4,00=5x
0,80 =x y= 3,90-3(0,80)/2
y= 0,75
EL café cuesta 0,80 y la infusión 0,75