Complete the explanation of whether the equation is a linear equation.

y = x^2-4

How to do this , and can some one explain

Find the equation of a line that is perpendicular to line g that contains (p, q). coordinate plane with line g that passes through the points negative 3 comma 6 and 0 comma 5 3x − y = 3p − q 3x + y = q − 3p x − y = p − q x + y = q − p

Math i have no idea how to do a and b