Which graph represents y as a function of x?

Graph A represents y as a function of x

Step-by-step explanation:

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The correct option is 4. The measure of minor arc BD is 100°.

Step-by-step explanation:

Given information: ∠BCA=40° and ∠BCD is a circumscribed angle of circle A.

Since ∠BCD is a circumscribed angle of circle A, therefore the line AC bisects ∠BCD.

Let the measure of minor arc BD be x. So, the measure of major arc BD is 360-x.

According to the properties of intersection of arcs outside the side the circle,

The measure of minor arc BD is 100°. Therefore correct option is 4.