Final answer:
The constant of variation is 9 and the equation representing the direct variation is y = 9x.
Step-by-step explanation:
In this case, the conversion of square feet to square yards is represented by direct variation. Since 3 square yards are equivalent to 27 square feet, we can determine the constant of variation by dividing the number of square feet by the number of square yards. So, the constant of variation is 27/3 = 9.
To represent this direct variation equation, we use the formula y = kx, where y represents the number of square yards, x represents the number of square feet, and k represents the constant of variation. In this case, the equation would be y = 9x.