Idon’t understand this and it’s due tomorrow. thx

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Does the point (1, sqrt 7) lie on circle shown.

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?