Question

Find the equation for the line L. Note the x-coordinate of the point Q is 3, y-coordinate of the point P is 17, and the parabola has equation y=x^2+4.

Answer 1

What does the parabola have to do with the line?

Answer 2

Well i think you have use it to find the missing values, like point Q (3,y) and point P (x,17), but i still don't know how to find the equation of the line using these two points.

Answer 3

the line intersects the parabola at those two points.

Answer 4

clearly, Q=(3,13) and P=(√13,17)
Now just use the 2-point form of the line.