It is 19. Hope this helps!!
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Answer:
A and B: Isosceles (having two sides of equal length)
C: Equilateral (all sides are equal)
The Y intercept is where the function passes/ intercepts the y axis. On a table, it is where x is 0, in this case the y intercept is -20. The slope is found by change in y over change in x. So choose any two coordinates to find change. 10/5=2. So your answer is A.
