Final answer:
The linear equation for the dance studio's special pricing without an application fee is C = 50x, which is achieved by changing the y-intercept to 0 in the original equation.
Step-by-step explanation:
The dance studio is running a "no application fee" special during the month of January, which means the initial application fee of 75 is waived. The linear equation representing the cost without this fee would be C = 50x, as the 75 one-time fee is no longer being charged. To adjust the original equation C = 50x + 75 to reflect the new pricing, we would change the y-intercept to 0, making the correct adjustment D) Change the y-intercept to 0. The slope remains the same because the monthly membership cost of 50 has not changed, so the rate of change per month is still $50.