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In the last equation it hast to be on the bottom 43 not just 4
Answer:
depends on how you understand math.
Answer:
Zero
Step-by-step explanation:
The formula for slope is y2-y1 over x2-x1
y2=second y point
y1=first y point
x2=second x point
x1=first x point
1 - 1
___
-3-5
0/-8
Since the number on top is zero the slope would be also. If the zero was on the bottom the slope would be undefined.
The element 
is the entry in the 1st row and 3rd column of the matrix, which, in this case, is 7.
Edit: Got my rows/columns mixed up! Row 1, Column 3 is actually -1, as the original poster pointed out.
