Based on the given information, which conjecture is invalid?

given: two non-coinciding lines intersect at point b.
the two lines are perpendicular.

the two lines are parallel.

the two lines form vertical angles.

the two lines intersect at no other points.

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.

6 spoons of sugar for every 21 cups of flour

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