Answer:
k= 0
Step-by-step explanation:
[tex]\boxed{ slope = \frac{y _{1} - y_2 }{x_1 - x_2} }[/tex]
where (x₁, y₁) is the first coordinate and (x₂, y₂) is the second coordinate
[tex] - 7 = \frac{k - 7}{ - 8 - ( - 9)} [/tex]
[tex] - 7 = \frac{k - 7}{ - 8 + 9} [/tex]
[tex] - 7 = \frac{k - 7}{1} [/tex]
k -7= -7
+7 on both sides:
k= -7 +7
k= 0
