Answer:
u = - 3
Step-by-step explanation:
Calculate the slope m using the gradient formula
m = [tex]\frac{y_{2-y_{1} } }{x_{2-x_{1} } }[/tex]
with (x₁, y₁ ) = (- 6, 4) and (x₂, y₂ ) = (- 5, u)
m = [tex]\frac{u-4}{-5+6}[/tex] = [tex]\frac{u-4}{1}[/tex] = - 7, hence
u - 4 = - 7 ( add 4 to both sides )
u = - 3
