Please answer quick its math

Me find the measure to side a and the process to solve the problem you appreciate it : )

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Explain why the function is discontinuous at the given number a. (select all that apply.) f(x) = 1 x + 1 a = −1 f(−1) is undefined. lim x→−1+ f(x) and lim x→−1− f(x) exist, but are not equal. lim x→−1 f(x) does not exist. f(−1) and lim x→−1 f(x) exist, but are not equal. none of the above