GEOMETRY. I need help Is this right or not?

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?

What are the soultion(s) to the quadratic equation 40- x^2=0

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}