2y + 5z + 3w = 12
x + y + z + w = 1
2x + 3z + 2w = 5
3x - y + w = -2
x + y + z + w = 1
2x + 3z + 2w = 5
3x - y + w = -2
-
I won't do your homework for you...
solve for any variable in the 1st equation, then write that equation in place of that variable in the next equation, then in that 2nd equation solve for a different variable. Then repeat for the 3rd and 4th equations until you get a variable equal to an actual number value. Then plug it in backwards to successively solve for the remaining variables.
I assume you're going to have to do this on a test or quiz, where you won't be able to ask on yahoo.
solve for any variable in the 1st equation, then write that equation in place of that variable in the next equation, then in that 2nd equation solve for a different variable. Then repeat for the 3rd and 4th equations until you get a variable equal to an actual number value. Then plug it in backwards to successively solve for the remaining variables.
I assume you're going to have to do this on a test or quiz, where you won't be able to ask on yahoo.