Answer:
Perpendicular.
Explanation:
The 2 slope m1 and m2 are equal if the lines are parallel.
If they are perpendicular, m1 * m2 = -1.
2x+7y=28
7y = -2x + 28
y = (-2/7)x + 4
- the slope is -2/7.
7x-2y=4
-2y = -7x + 4
y = (7/2)x - 2
- the slope is 7/2.
Now -2/7 * 7/2
= -14/14
= -1.
So the 2 lines are perpendicular.