Hello! I'd like help with these two questions;

Question

38. Given triangle ABC with A(-3, 2), B(-1,-4), and C(4,1), write the equation for the line containing altitude AR in standard form.
A. x - y = 1
B. x + y = -1
C. x + y = 1
D. x - y = -1 ***

39. Given triangle ABD with A(-2, 2), B(2, 4), and C(4, -4), write the equation of the line containing midsegment XZ in standard form, where X is the midpoint of segment AB and Z is the midpoint of segment BC
A. x - y = 3
B. y - x = 3
C. x + y = -3
D. x + y = 3 ***

I honestly do not understand how to do these at all, and I've looked at my notes but didn't get any of the following answers. I just picked the closest things to my answers. Please help... and thanks!

Answer 1

Okay I just left it and submitted it, and got the second one right, but the first one was actually B.