Daniel wrote the following two-column proof for the given information. given: ab = 3x + 2; bc = 4x + 8; ac = 38 prove: x = 4 statements reason 1. ab = 3x + 2; bc = 4x + 8; ac = 38 1. given 2. ab + bc = ac 2. angle addition postulate 3. 3x + 2 + 4x + 8 = 38 3. substitution property of equality 4. 7x + 10 = 38 4. combining like terms 5. 7x = 28 5. subtraction property of equality 6. x = 4 6. division property of equality on which line, did daniel make his error? line 2 line 3 line 4 line 5