Help please help help

Is it true or false i’m trying to pass this test so i can leave school

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers