9.) Calculate the number of minutes that Carlos called within Canada, to the United States, and to Mexico during the month of December. The charges are 28C/min within Canada, 30C/min to the U. S., and 84c/min to Mexico if
the following conditions applied:
His total bill for the month was $90.96
He talked twice as long to Mexico as he did to the U. S.
. The total number of minutes spent talking within Canada and to Mexico was 122.
Let c represent the number of minutes within Canada
Let u represent the number of minutes to the United States
Let m represent the number of minutes to Mexico
Express the problem as a system of linear equations: