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Explanation:
Let's find the slope of line AB
m = (y2-y1)/(x2-x1)
m = (7-(-3))/(-4-1)
m = (7+3)/(-4-1)
m = 10/(-5)
m = -2
The slope of line AB is -2
The slope of any line parallel to line AB will also have the same slope.
Parallel lines have equal slopes, but different y intercepts.
