When x =1/2 what’s is value of 8x-3/x

Can someone me out here and the tell me the greatest common factor

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

What is the value of p in the equation y^ = -4x?