Question

What is the constant of variation, k, of the direct variation, y = kx, through (5, 8)?

k = – k equals negative StartFraction 8 Over 5 EndFraction.
k = – k equals negative StartFraction 5 Over 8 EndFraction.
k = k equals StartFraction 5 Over 8 EndFraction.
k = k equals StartFraction 8 Over 5 EndFraction.

Answer 1

Use 8 = k·5, so k = 8/5.

Answer: k = 8/5.