Question

What is the constant of variation, k, of the line y = kx through (3,18) and (5,30)?

Answer 1

Y - 18 = (30 - 18)/(5 - 3) (x - 3)
y - 18 = 12/2 (x - 3)
y - 18 = 6(x - 3) = 6x - 18
y = 6x

The constant of variation (k) is 6.