Step-by-step explanation:
Perhaps you want to solve the equation for the value of x. If so then let us work it out:

Y=-X+4 finding the y intercept, b and slope, mx thus y=mx+b
12.8 is the answer to this problem
So, we need to multiply these values, since we are looking for distance.

He travelled 162km.
Hope this helps!
1-8sin^2 Acos^2A or 1-8sin^2A