Question

If y = 8 when x = 4, find y when x = 5.

Answer 1

That means y is twice as big as x. If x is 5, then twice as big as 5 is 10
Answer : 10

Answer 2

we would have to assume a constant of variation; otherwis ethe question has no answer

Answer 3

y = x + 4 satisifes; the when x = 5, y = 9

Answer 4

as is, wed hope to assume a relation that varies directly; and make it y = 2x