book Maths Puzzle Numerical Ability

EaCH DAY A TRAIN LEAVES PARIS FOR MOSCOW AND AT THE SAME TIME ONE LEAVES MOSCOW FOR PARIS. THE JOURNEYS LAST EXACTLY SEVEN DAYS. HOW MANY TRAINS WILL A PASSENGER MEET ON THE JOURN

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The sum of three times one number and twice the second is -1. The ratio of twice the first to 3 times the second is -4:3. What are the numbers? I got the first equation -1=3x+2y. Irma invested some money a 7% and $100 less than that at 8%. Her total interest was $58. How muc did she invest at 7%, rounded to the nearest dollar?