Question

slope=-2/5, contains the point (10, 3)

Answer 1

To find the line, you need to use the point-slope formula because you're given both the slope and a point.
y - y₁ = m(x - x₁)

m = -2/5
x₁ = 10
y₁ = 3

y - 3 = -2/5(x - 10)
y - 3 = -2/5x + 4
y = -2/5x + 1

y = -2/5x + 1 is the line.

Answer 2

The answer for this problem is y = -2/5x + 1