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

Answer 1

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

Answer 2

Yup, you got it right so far.

Answer 3

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

Answer 4

Yup!

Answer 5

okay, so i got.-0.4

Answer 6

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

Answer 7

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?