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calculistaThe question in English Carlos paid a $ 300 bill with $ 5 and $ 10 bills. In total 45 bills to make the payment. How many tickets did Carlos use? let x------> quantity of $5 bills y------> quantity of $10 bills we know that x+y=45------>x=45-y-----> equation 1 5x+10y=300----> equation 2 substitute the equation 1 in equation 2 5*[45-y]+10y=300----> 225-5y+10y=300----> 5y=75----> y=15 x=45-y-----> x=45-15-----> x=30 the answer is quantity of $5 bills is 30 quantity of $10 bills is 15 the answer in Spanish Hagamos x------> cantidad de billetes de $5 y------> cantidad de billetes de $10 Sabemos que x+y=45------>x=45-y-----> ecuacion 1 5x+10y=300----> ecuacion 2 sutituya la ecuacion 1 en la ecuacion 2 5*[45-y]+10y=300----> 225-5y+10y=300----> 5y=75----> y=15 x=45-y-----> x=45-15-----> x=30 la respuesta es cantidad de billetes de $5 es 30 cantidad de billetes de $10 es 15