Answer: yes it has a proportional relationship
Step-by-step explanation: Well yes it is proportional because it goes through the orgin and that is what it is if it goes through the orgin (0,0) it means it has a proportional relationship hope this helped:)
It should be the first one since the x and y cross each other out and leave only =-10
The answer is 0.6 because you divide 21 by 35 and get 0.6
Is 12 Because the pattern is 2+1=3; 4+2=6;
6+3=9; 8+4=12 and 10+5=15
If it has 3 sides then it's a triangle.
Using the formula
where

and a=5 b=5 c=8
∴