Joanie believes that you cannot use cross products to solve the proportion for x. She says that if you multiply both sides of th
e equation by x, you get Then, if you multiply both sides of the equation by 3, you get, which is a different equation than you would get if you cross multiplied. What mistake did Joanie make in her reasoning?
She assumed that 50x = 75 is the equation that you get if you multiply both sides of the equation 50x/3 = 75 by 3. In short, the answer is C/the third option.