12. Line / is shown on the graph below. If another line is drawn, perpendicular to
line I, what must be its slope?
A. -3
B. 3
O. 0
D. undefined

It should be a or d i’m not sure

Ithink the answer is b.

The median segment divides the triangle into 2 isosceles triangles and everything else is trivial.|ad|=|bc|2=|bd|soδadb  is isosceles with∠dab=∠dbasimilarlyδadc  is isosceles with  ∠dac=∠dca∠cab=∠cad+∠bad=∠acb+∠abctherefore∠cab  is a right angleandbc  is the hypotenuse of a right-angled triangle.hope this