If a coordinate pair (x, y) makes the equation 4x + 5y = −5 true, which of the following statements is true?
a. These values of x and y are the only ones that satisfy 4x + 5y = −5.
b. The point (x, y) is not on the graph of 4x + 5y = −5.
c. The point (x, y) is on the graph of 4x + 5y = −5.
d. The coordinate pair (2x, 2y) also makes the equation true