Question

-3x-y=-9: y-4z=7: x-2y+z=-5 how do you solve this

Answer 1

pick an easy number that fits all three equations
and multiply the other two, then subtract

Answer 2

-3x - y = 9
y - 4z = 7
x -2y + z = -5

Answer 3

well first you have to deal with only two of the equations, once they're made into one, you do the same to the 3rd

Answer 4

( y - 4z = 7 )
4(x -2y + z = -5)
_____________________

Answer 5

y - 4z = 7
4x -8y + 4z = -20
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Answer 6

Sometimes you have to subtract and sometimes it's adding the equations so either x, y, or z cancels out

Answer 7

_____________________
4x - 7y = -13

Answer 8

4x - 7y = -13
-3x- y =-9
______________________
(multiply one equation by something to make x or y equal to the other eq,
then add or subtract the whole eq)

Answer 9

I hope you get it!