Answer:
4 or 4/1 (both the same thing just with plotting point writing 4/1 is easier for me so I know to go up 4 over 1 :) )
Explanation:
Parallel lines have the same slope, so both lines will have the same slope. Use line 1’s points to find the slope with the formula
(y1-y2)/(x1-x2)
(5-1)/(-2-(-3)
4/1=4