Determine constant of proportionality.. ANSWER ASAP PLS

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

This circle is centered at the origin, and the length of its radius is 6. what is the circle's equation? a. x^2+y^2=36 b x^2+y^2=6 c x+y=36 d x^6+y^6=1