Question

Y = kx The constant of variation in this equation is???? y = 4x

Answer 1

Y = kx

Where 'k' is the constant of variation. 

y = 4x means that 4 is the constant of variation. 

Answer: 4

Answer 2

Y = 4x shows that 4 is the constant of variation. 
Answer: 4, the number next to x.