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1) If the slope of line a is 5 and the slope of line b is -5, then what is true about lines a and b (assume lines a and b are coplanar)?

A. they are parallel
B. they are perpendicular
C. they are intersecting lines

2) If the slope of line a is 1/4 and the slope of line b is -1/4, then what is true about lines a and b (assume lines a and b are coplanar)?

A. they are parallel
B. they are perpendicular
C. they are intersecting lines

3) If the slope of line a is 3 and the slope of line b is 3, then what is true about lines a and b (assume lines a and b are coplanar)?

A. they are parallel
B. they are perpendicular
C. they are intersecting lines