Explain work
1. tell whether the set of ordered pairs satisfies a linear function.
{(4, 12), (6, 9), (8, 6), (10, 3), (12, 0)}

2. tell whether the set of ordered pairs satisfies a linear function.
{(12, 11), (8, 8), (4, 5), (0, 2), (-4, 0)}

3. tell whether the set of ordered pairs satisfies a linear function.
{(-4, -1), (-2, 4), (0, 9), (4, 19), (6, 24)}