Describe a real life multiplication situation for which an estimate makes sense. explain why it makes sense

This question awards 100 ! i really don’t want to fail i will also mark you !

Nine more than four times a number is the same as one less than twice the number. find the number?

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