Katha walks 5 blocks east. Then she walks straight back to where she started and walk 5 blocks west. Graph 5 on the number lines

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

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?

Math i have no idea how to do a and b