Answer:
when they are intersecting at a 90 degree angle.
Step-by-step explanation:
when lines intersect, they just cross over one another at any point. but with perpendicular lines, they have to be at a right angle. an example of this is a square. all of its corners are perpendicular
I think it is scend choose
X.x.x (multiplication), it would be x^3
Hope it helped!
15y = 7x + 8
15y - 7x - 8 = 0
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1 hour = 60 min
0.5 hours = 60 * 0.5 = 30 min.