How to do a ratio box with fractions? 7th grade

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

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

Which of the following best describes the delian problem?