Which coordinate plane represents the linear relationship 4x+5y=20

Ineed with number 6 , explain how to get 1978

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

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?