Which one of the following is true about perpendicular lines?
a. they intersect at one point
b. they intersect to form an acute angle.
c. they intersect to for an obtuse angle.
d. they never intersect.

the answer is c

step-by-step explanation:

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square