There is an infinite number of solutions:1) Solve: .
kelsikels, you should have at least tried yourself! For example, if you add the first and second equations, the "y" and "-y" cancel leaving you an equation in only x and z. If you add the first and third equations, again "y" and "-y", giving a second equation in only x and y. If those are "independent" (neither equation is just a multiple of the other) you can solve those two equations for x and z, then go back and solve for y. If they are not, as Soroban implies, you can solve for, say, x, in terms of z and then solve for y in terms of z. That gives a different solution for each value of z.