If you were to use the elimination method to solve the following system, choose the new system of equations that would result after the variable z is eliminated in the first and second equations, then the second and third equations. (Equation 1) x + y - 3z = -8(Equation 2) 2x + 2y + z = 12(Equation 3) 3x + y - z = -2. PLEASE HELP !

Question

anonymous · Answer

now sovle the 1st and 2nd eqn and keeping in mind that z has to be removed so wwe have to make the coefficents of  z equal:
x+y-3z=-8 ---1eqn
6x+6y+3z=36---2 eqn after it was multipled by 3 so to make coefficents of z equal
thenn adding these eqns we could remove z so the resulting eqn is:
7x+7y=28

anonymous · Answer

then solve like this for the 2nd and 3rd eqn by eliminating z....

anonymous · Answer

thank you!

anonymous · Answer

glad to help  :D  !!!!!!!!