-5x + 6y = -1

Is this a direct variation?

Tell weather the equation 3x -6y = 0 is a direct variation. If the equation is a direct variation, identify the constant of variation

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.