First find the equation of y.

Find the slope m.
.
Pick one point, I'll pick (-3, 9). Insert coordinates in equation then compute n.
.
The equation of a line y is:
.
The perpendicular line
is same like the normal line except its slope m becomes:
.
The equation of a perpendicular bisector is thus:
.
Hope this helps.
Answer:
d x=+-3
Step-by-step explanation:
divide both sides by 2
The answer is 6.5t2+0.5t−5.5 , it’s simplified