If x is directly proportional to y and x = 6 when y = 18, what is x when y = 24?

If x is directly proportional to y, it means that as x increase, y also increases and vice versa. This could be done another way. Since I am already given a point of x and y, I could simply find the difference between x and y, which would be 12 in this case. To find the x value when y is 24, I would simply either add or subtract that difference. Depending on which of the x or y value is higher. In this case, since we are solving for y and y is larger than x, I would subtract it. Meaning x would be 12.

The surface area would be 576 because you multiply all the numbers then multiply that number by 6