4x - y + z = -5
-x + y -z = 5
2x -z -1 = y

linear systems 3 variables I'm lost

Step-by-step explanation:

rewriting the third equation

add to second equation to the first

I add third equation to the second

substitute z = -3 into either one of the other two equations and solve for y

x = 0

y = 2

z = -3

“a term can be a signed number, a variable, or a constant multiplied by a + sign or j sign. in , the terms are 5x , 3y and 8. when a term is made up of a constant multiplied by a variable or variables, that constant is called a coefficient.” i hope this you.