2x + 4y = 4 3m + 4 = 0 al = 2a - 1 x? - 5x + 2 = 0 7p = 2p + 4 4 2s - 2r = 0 5x2 100 3q² = q + 6 5a - 8b = 1 Answer the following questions: 1. In the given table, which of them are linear equation? Why? 2. In the given table, which of them are not linear? Why? 3. How are these not linear equations different from linear? Do they have common characteristics?