Question

Need help please!

Answer 1

Sounds like 2 parallel lines.

Consider

2x-3y = 5

and

2x-3y = 7

These lines have the same slope and are thus parallel. Parallel lines never intersect. So there is no algebraic or graphical solution.

Answer 2

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We'll set up the first two equations so z=1 and the last so it doesn't, no solutions.

x + y + z = 1

x + y + 2z = 2

z = 0