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A historian writes an essay on the rise of communism in China during the 20th century. She claims that communism would never have taken hold in the country if the Soviet Union has not supplied the Chiese commuunists with money and military equipment.
A valid claim in math is that you prove whenether the question or answer is resonable. in other words, you have to tell if it is biased or not biased. Biased is invalid claim.
Substitute the coordinates of the point into the equation of the line. If the equation is still valid then the point is on the line; if not then it is not.
If this was true, you could simply toss the coin at least 40 times to know whether the statement is (or isn't) valid.