Question 43530
A) y = 4 C) x = 4 
B) y = -2x D) y = x + 4

The first thing to do is calculate the slope of your line
 {{{m=y(2)-y(1)/x(2)-x(1)}}} (these are subscripts not exponents) we get 2/0 which means that we have a vertical line or x=4 (both x values are 4 in your two points)