Question

please help ???:(

-2x + y = 1
-4x + y = -1

(3, 1)
(-1, 3)
(-1, -3)
(1, 3)

Answer 1

Throw the '-2x' to the other side in first equation. You get:
y = 1 + 2x
Plug this equation into second one:

-4x + (1 + 2x) = -1
-2x = -2
x = 1

And plug this 'x' value in one of the equations.
-4(1) + y = -1
y = 3

Answer 2

2x + y = 1
4x + 2y = -1

x = 0
x = 2
There is no x value, as there is no solution.
x can be any value, as there is an infinite number of solutions.

Answer 3

Yes. Correct