Question

Will give medal
solve the system by substitution (Show Work)
-x-y-z=-8
-4x+4y+5z=7
2x+2z=4

Answer 1

3 equations. 3 unknowns

what have you tried?

Answer 2

Input:


{-x-y-z = -8, -4 x+4 y+5 z = 7, 2 x+2 z = 4}

Answer 3

solution x=3,y=6, z=-1 @hartnn I have the answer I need it to be checked

Answer 4

@AravindG can you help

Answer 5

eliminate y from the first two equations using elimination method

Answer 6

Pick a variable to eliminate it and Eliminate it in two equations.

Say the first two equations.

Then eliminate the same variable in the other two equations

Say equations 1 and 3


Then you'll have two new equations you can use to find two of your variables.

Answer 7

then use anyone of the equation and then simultaneously solve it with the third one

Answer 8

Just a tip: Try finding one variable in terms of other two from one of these equations. Substitute this variable in the next two equations. You get two equations with 2 unknowns. Now it can be solved easily.

Answer 9

ok thank you