[" The line passing through the points "(5,1,a)" and "(3,b,1)" crosses the "yz" -plane at the point "],[" then "a-b=]

The line passing through the points (5,1,a) and (3,b,1) cross the yz -plane at the point (0,17/2,-13/2) .Then

The line passing through the points (5,1,a) and (3,b,1) crosses the yz-plane at the point (0,17/2,(-13)/2) .Then

If the line passing through the point (5,1,a) and (3,b,1) crosses the yz-plane, at the point (0,17/2, -13/2) then

If the line passing through the points (5,1,p) and (3,q,1) crosses the YZ plane at the point (0,17/2, -13/2) , then

The line passing through the points (5, 1, a) and (3, b, 1) crosses the YZ-plane at the point (0, (17)/(2), -(13)/(2)) . Then,