Verified Answer :

The gradient (or the slope) would be 9/2.

Slope between (2, 5) and (0, -4),  x₁ = 2, y₁ = 5   x₂ = 0, y₂ = -4

Slope = (y₂ - y₁) / (x₂ - x₁) = (-4 - 5) / (0 - 2) = -9/-2 =9/2 = 4.5

Slope = 9/2 = 4.5

Hope this helps.