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

Question

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

anonymous · Answer

so far i hve 5x=-2? this is right

anonymous · Answer

Yup, you got it right so far.

anonymous · Answer

so, do i hve to divide -2 by 5 now?

anonymous · Answer

Yup!

anonymous · Answer

okay, so i got.-0.4

anonymous · Answer

Perfect, now substitute it into either equation to come up with the value of the other variable.

anonymous · Answer

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?