What is the slope of the line that passes through the points (4,8) and (2,12) In the simplest form

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.