Help please, i don’t understand

Two lines that do not intersect are skew. always sometimes or never

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)