If a is a rational number and b is a rational number, then the product ab must be

rational.

Step-by-step explanation:

This is rational under the closure property of multiplication which states that the product of 2 values in the same set will also be a member of the same set, which in this case is the rational number set.

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

if im not mistaking its

step-by-step explanation: