y = 8
using the ' gradient formula' m = (y₂ - y₁)/(x₂ - x₁)
with (x₁, y₁) = (3, 3), (x₂, y₂) = (- 5, y) and m = - [tex]\frac{5}{8}[/tex]
(y - 3)/( - 5 - 3) = - [tex]\frac{5}{8}[/tex]
(y - 3)/(-8) = - [tex]\frac{5}{8}[/tex]
multiply both sides by - 8 to eliminate fractions
y - 3 = 5
add 3 to both sides
y = 5 + 3 =8
