A - b, a(2, 4) b(-3, 7)

To calculate the difference between a and b, we need to subtract the corresponding components of a and b.

Given: a = (2, 4) b = (-3, 7)

To calculate a - b: (a - b) = (2 - (-3), 4 - 7) = (2 + 3, 4 - 7) = (5, -3)

Therefore, the difference between a and b is (5, -3).