Which expressions are equivalent to 16x^2- 36

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

Ined this is due tomorrow and i dont know the answer can you find all the exponents

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?