It’s something for my exam

How can we find the measure of an exterior angle if we know the measurement of an interior angle

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.