Does wheelies skates and stuff have a linear or non linear relationship? explain.

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

If 3x+8=3x+8 is it one solution or no solution

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?