Please help me on this question

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

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?