Question 651012
Plug in the numbers (2,4,1) for (x,y,z) in each equation.  If all three are true, then that is a solution.<P>
Is the first equation supposed to be 2x-4y+z=-11?  If so, it's true.  If not, it's not true and therefore the given ordered triple doesn't solve the system.<P>
2(2) -4(4) +1 = -11 --> 4-16+1 = -11 is true.<P>
2+4 = 6 is true<P>
2(4)-1 = 7 is true.<P>