Solve the following system of linear equations by addition. Indicate whether the given system of linear equations is consistent, inconsistent, or dependent. If the system is consistent, find the solution.

Question

{−7x + 7y −9x + 9y == −21 −27

Answer 1

your equations are jumbled and garbled

did you mean:
-7x + 7y = -21 and -9x + 9y = -27 ??

dividing the first one by -7 and the second by -9 produces the same equation,
x - y = 3

So they are both one and the same equation.
Look up how each of your classifications is defined in your text or in your notes.