Consider the point (x, y) lying on the graph of the line

Question

Consider the point (x, y) lying on the graph of the line 8x + 7y = 3. Let L be the distance from the point (x,y) to the origin (0,0). Write L as a function of x.

Answer 1

The point can be represented as [x,(3-8x)/7]'

The distance to the origin L=sqrt[x²+(3-8x)²/49].