A 20% coupon for a $30 item makes the cost $6

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

One integer is 5 more than another. their product is 104. find the integers

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