Answer:
Sorry,I don't have credit card ...Hope get it in future
A right triangle contains a right angle, so it must have two sides that are perpendicular. If the slopes of two sides can be shown to be negative reciprocals of each other, then it can be concluded that a right angle is formed. If a triangle contains a right angle, then it is a right triangle.
C = -4 that’s the answer if you didn’t see my comment
Could you do 31 add 31 which would also be 31 multiplyed by 2
hope this helps
