Question

systems of equations

Answer 1

You can add and subtract equations to cancel out variables. look at the 2nd and 3rd equations. If you multiply the 2nd equation by -2 ( do it to every term ) then add it to the 3rd equation you will cancel out x and y terms. When you add, just put one equation above the other with the like variables in the same order, then simply add

Answer 2

once you get z, I would solve the second equation for either x and y and substitute that into equation 1 and solve for the missing variable. then you just have one unknown and you can choose any equation to solve for it

Answer 3

so it'd be C then ?

Answer 4

hey i have solved it..!! nd i guess the answer should be A

Answer 5

oops that is right I miscalculated. thanks to both of you!