-9-(-12)=-9+12=3
-9-12=-9+(-12)=-21
You are asking for the condition needed for the
<span>two segments to be perpendicular to each other. </span>
<span>If the slope of one segment is m, then the slope of a perpendicular segment would be -1/m </span>
<span>this means that m2 = -1/m and so m2 x m = -1 </span>
<span>If you look carefully at your choices, the 3rd answer involves the two slope and has the -1. It's </span>
<span>the correct answer.</span>
For the first one a = 2.5. For the second one m = 4. For the third one m = -4
Answer:
B
Step-by-step explanation:
