The graph shows a proportional relationship between the variables x and y.

A. Write an equation to model the relationship

B. Explain how you know if an equation or a graph
represents a proportional relationship.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

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