Hey can you me posted picture of question

X+ y = 5 ; x - y =3 solve using linear combination

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

How many grams the dog will eat in 3 days?