R/2=(r-4)/7 how do i solve this?

If a(0,0,0) and b(2,2,2) are points in coordinate space, how many paths are there from a to b that move from one lattice point to another in the positive x-,y- or z- direction?

Which point is on the line y=-2+3? (-2,-1) (3,3) (3,-3) (-3,-9)

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4