If 424 students attended the spring dance, how many students attended the fall dance?

Solve for x i'll try to attach the files bc it's not letting me for some reason

Which one ? is the answer and how to find this answer

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36