Red ! Add the corresponding x coordinates and then divide by 2. Repeat for the y values
For A B and C, you just plug in the given number
A

B

C

And for D, you set the equation to 26 and solve for n

I had to use x instead of n, but for D n=7. :)
The answer is C. Isosceles Triangle .... 2 of the sides are equal
-(3x-2)=-4(x+1)-4
-3x+2=-4x-4-4
-3x+4x=-4-4-2
x=-10
Answer: sometimes
Step-by-step explanation: