Question

solve x + y + z = -6
x - y + z = -2
2x + y - 3z = 5

Answer 1

Add the first and second equations, and y will drop out.
Then add the second and third equation, and y will drop out again.
Use the two equations in two unknowns above to solve for x and z.
Then substitute to solve for y.

Answer 2

@mathstudent55 can you walk me through it please ?

Answer 3

Can you add the first two equations?

x + y + z = -6
+ x - y + z = -2
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