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Determine whether the system of linear equations has one and only one solution, infinitely many solutions, or no solution. 2x − y = 5 3x + y = −7

Mathematics
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so far i hve 5x=-2? this is right
Yup, you got it right so far.
so, do i hve to divide -2 by 5 now?

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Other answers:

Yup!
okay, so i got.-0.4
Perfect, now substitute it into either equation to come up with the value of the other variable.
okay so now i have 2(-0.4)-y=5. den -0.8-y=5. dont i add 0.8 to 5? if so i got 4.2? i den plug it into one of the equations 2x-y=5 and the answer isnt the same. wat did i do wrong?

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